I used to be out on the road at client premises 4 days a week (travelling for up to 4 hours a day, plus remaining on site for at least 6 hours), and had a day at home writing up reports.
Now the 4 hours travelling has gone, I WFH 5 days a week, have much shorter virtual meetings with clients remotely and seem to get more done, can write reports as I go, and instead of being a very lonely and insular life, I now talk to distant colleagues and people from random depts at HQ (that I never knew existed) multiple times a day.
For me personally, working life has become much more "connected" and social than it ever was before, and I much prefer it. There is some talk of putting us back on the road for maybe 2 days a week when restrictions are lifted, but I wouldn't be that bothered (and keep telling my boss I don't want to).
But I think this is very much specific to the kind of job I do - if I think back to roles I've had which were 100% office based, I can absolutely see how it wouldn't be comfortable to do that from home full time. I do consider myself very lucky that the impact has been positive, because for every one of me there must be 4 people hating it. Plus, I have no young children to home school, which must be a huge drain and I have no idea how people are coping with it. 