I'm just making it clear that these edits are based on information obtained while visiting Berlin in person.

I have been thinking about this changeset over the last couple of months. I revisited the duplicate ways at changeset changeset/46547845 and I was going to let you know here at the time, but to be honest I couldn't be bothered. In fact I couldn't be bothered with OSM at all up until now (I had some local edits to do but didn't feel like doing them until now). The reason is that I was unhappy about some of the comments made here.
To be clear, I am not talking about issues regarding tagging changes. What I am talking about is the accusation that I deleted objects without checking (when I was actually deleting duplicates). Christopher had the decency to ask what I had done. Nakaner on the other hand accused me of deleting the bus platform at Schönefeld and a mystery building in Strausberg. He asked the rhetorical question 'do you have local knowledge' (implying that as I'm editing from Australia I couldn't possibly know). He then questioned my other recent edits as being 'mechanical by definition' - I take this to mean my previous changesets (the ones marked 'from Europe holiday' - i.e. I had actually been there).
I didn't say anything at the time as I thought it best to leave it, but unfortunately I wasn't able to stop thinking about it. After this comment, I am not planning to say any more on this topic.

Sorry, I haven't had a chance to reply to any comments until now. (I replied to Christopher just before leaving for work this morning local time, Polarbear's first comment arrived as I was checking Christopher's query, and I didn't have a chance to address it before leaving.)
I have no problem with you reverting the edits (as you have already done). Just a couple of notes about the above comments to clarify what I had done.
The bus platform (way/447221657) was a duplicate way (duplicate of way/447221466 - shares the same nodes).
The only buildings I deleted were duplicates. (I didn't delete all the duplicate buildings e.g. some were part of relations, so I left those ones alone.)
Regarding opening hours, I used the opening hours tool in JOSM to fix the formatting. The times for Wednesday We 13:00-19:00 overrule the times for Mon-Thu, so my version is correct (your revised version looks clearer - thanks).

I deleted several duplicate ways, including the roof at Potsdam Hauptbahnhof - the way way/403603246 (which I didn't delete) had duplicate nodes and duplicate tags to the way I deleted.

I was wondering about this way:

way/371182878

It's marked as source = GPS tracks

When I visited here in 2010, the first section of the Big Bend track had been realigned (see the ways marked 'Big Bend Walk'). I was wondering if the old track had been reopened, or whether this way is traced over the GPS traces from before the realignment. Could you please clarify this?

I don't have my voice recordings from last year, so I don't recall the sign. There must be a Norah Creek somewhere, as there is a Norah Creek Road nearby! I'm not planning on going that way for a while, but I'll try to remember to check sometime with a survey.

Also, the tags religion/denomination tags should be religion=christian denomination=jehovahs_witness - see denomination=* for info

For the outline of the land around the Kingdom Hall, you can use landuse=religious - see landuse=religious for info.

OK - change made at changeset/40611879

See discussion at changeset/36774727 regarding increase in layer (nearby way/39196209 is footbridge, covered by these roads, but not connecting with these roads)

The construction=minor tag was added 3 years ago. I don't recall any work when I went through a year ago., so it should be safe to delete this tag.

Just letting you know that I have corrected the junction of Willow Vale Road. See changeset at changeset/37053627. Note current imagery (Bing, Mapbox and LPI) is out of date.

I'm just letting you know that I have reverted this section of the Great Western Highway to 'trunk'. Reasons: Route number is 'A32' (rather than 'M32'). There are several at-grade intersections. There is direct access to properties from this road (including houses and a fuel station). Please see discussion on the talk-au mailing list for more info.

I've checked my voice recording from my recent trip - Willow Vale Road definitely does not join Princes Highway.

Just a note about Willow Vale Road - I think it doesn't joint the highway here (just the ramp). If you use imagery, it may be the old imagery taken just prior to the newly-opened reconstructed highway. (LPI imagery still shows the old highway.)

Regarding tagging of asphalt roads: the Australian tagging guidelines state "you don't need to specify the surface=paved key/value pair as this is assumed" - this is not the same as saying we don't tag asphalt (etc) for paved roads. I think the asphalt tag should be replaced. If the tag is missing, it isn't clear if the road is paved, or if no-one has bothered to check the surface.