I've been WFH for most of the last year. I was in the office full time previously, although my job can involve visiting different parts of the country from time to time, all over the north west and midlands. The plan seems to be that we will be working one day a week in the office going forward, for a day where we get together and have meetings etc. Rest of the time will be from home. I'd happily work from home 5 days a week, but 4 at home and one in the office seems a decent balance. I'm not exaggerating when I say working from home has been life changing for me really - my commute to work was about 22 miles from door to door and that could take an hour or longer in the morning depending on traffic. Typically it took about 40 minutes but even with that it's amazing not having to do it, not to mention the fuel costs I'm saving. Over the winter particularly it's been great not having that scenario where it's dark by the time I'm leaving work. I'm sleeping more, I go for a lunchtime walk with the dog, and just generally have a much nicer time working than I've ever done before.
The other thing is that my office isn't in a city centre, it's in a business park with not much around it. I do feel sorry for the likes of the sandwich man who used to come round every lunchtime in his van, I expect he will really struggle or be out of business by now. But if we never go back to full time in the office I won't miss it at all.