I no longer live in the UK but spend a couple of weeks every year travelling around on the railway. I think I notice the increase in announcements more because of the gaps between my visits, as opposed to a gradual, daily acclimatisation. They have DEFINITELY increased A LOT in the last 12 months!
I realise it's "nanny-state-ism" and it probably isn't going to go away any time soon and there's a whole well-known argument about that making people LESS safe in the long run. I think it's too late now and probably something we can't just remove in one go.
The thing is, I just spent a week travelling around the UK followed by a week crossing Europe (Belgium, Germany, Switzerland, Austria, Czech Republic, Italy) and the difference is startling. It just doesn't happen there! The RELIEF after leaving the UK and finally being able to relax on a train...
There were mostly just a standard announcement before departure listing the route and then a "this is xxx, next station is yyy" at each stop. If all these countries can manage to be less far down the nanny-state rabbit hole than the UK then it obviously points to a much bigger problem there (Britain). I noticed the fewest announcement in Switzerland - known for being so well organised. How do they EVER run their railway so efficiently and punctually when the pax. aren't constantly berated about not blocking doors or falling over their own shoelaces? It makes you think...
EDIT: Oh and the worst services I found for announcements were the Birmingham cross city lines! There are 24 stops on Redditch to Lichfield Trent Valley (I can now reel them off in my sleep) and they're two or three minutes apart. The entire route is read out between each stop and rarely has chance to finish before being stepped-on by various safety announcements (which also interrupt each other and rarely finish before "we are now arrivng at..."). It literally was constant announcements with maybe a 10 second gap while the doors were actually open. Those 730s have big, clear screens with all the route information required and red and yellow "safety" stickers everywhere. I realise visually impaired people might need more announcements, but how about some kind of induction-loop, online system or special seats with a button and a speaker to allow only those who choose to do so to hear the announcements?