I am finding that I am quite productive at home, but I have a good "proper" setup, proper screen, decent office chair, printer, decent broadband etc. Some provided by work, some I have provided myself (DH and I had always done some WFH informally, so 1 office was well set up, and we decided over the summer to get a 2nd proper desk that can be easily dismantled in the spare room as this is not going away anytime soon).
I've actually changed role 3 times in the period since lockdown, within my organisation (1 was literally as we locked down, 2nd was an emergency project, and latest is a more urgent need within the office than going back to original new role). This has been more difficult because of not having people to just poke my head around the door to ask. But I managed the 1st 2 and I'm getting there on the 3rd.
I don't have decent enough Work-Life boundaries, but am trying to step away from the desk more often at home.
But I also miss the general camaraderie of the office as well. And the fact that being in the city centre, I could go out and get a nice lunch if I forgot to bring one in (not "what is least boring in the fridge"), and do any shopping I needed to (clothes, pharmacy, posh toiletries, kitchen tools/baking stuff etc).
I have been into my office a few times since lockdown - I needed to go in for the urgent project intermittently (briefing senior management, and dealing with Parliament) but only twice since changing again (to print large docs and deal with ICT problems), so the last trip included grabbing 4 extra reams of paper and an extra toner for my printer. And going to the proper stationers for pens etc - I am so used to just running in on my way from the train in the morning that I was not used to planning ahead for small things like more paperclips or staples....
I had been travelling a lot before so was one of the relatively few who already had small tablets which linked directly into our servers - ICT had been starting to give people with those docking stations and removing pcs, so I think it will be a lot more variable once we do return and that there will be more flexibility to WFH occasionally (whether formally or informally) as this period has shown that, generally, the work of our organisation has continued, both responding to the emergency caused by the pandemic and finding urgent solutions for business, and the normal work continuing on (there was a small hiatus but generally now most areas are continuing their day to day work without much apparent difference to the customer, except no face to face meetings happening).
But I KNOW that I am lucky, having decent broadband, and having a separate space for my work which is not in the communal areas of the house. (And that teen DD has gone back to school in person - although in fairness, she did work hard during the school day when in lockdown - but the minute 4 o'clock came, she was off the clock and constantly "bored" and "hungry"). Lots of others I work with have smaller DCs in their houses, are working on their dining table or even sofas, or both adults (or even adult DCs as well) working together in the same room etc and in small apartments etc. So it doesn't work for every household situation.