From what I have seen on their websites, several of the museums, etc. seem to be requiring advanced tickets, when perhaps they had not in the "before times." I see, though, that St. Mark's Basilica and the Campanile are now (or at least for now) requiring purchase on site. (I cannot tell if this is seasonal or perhaps pandemic-related.) On another online Italy travel forum, a traveler has reported that folks in line for entry to several sites were told that they were not admitting anyone who didn't have prior reservations.
My trip isn't for a few months, so things could change in the meantime, but for those who are now traveling or have just recently traveled, what seems to be status of sites that generally aren't thought to be crowded? In other words, I will certainly plan to pre-order tickets/tours for the most visited/crowded sites (Colosseum, Vatican, Borghese, etc.). Should I also plan to pre-order tickets for other sites--in Florence, for instance, the Bargello, Medici Chapels, etc.? Are we needing to forego a bit of spontaneity and pre-purchase tickets to more sites than we would have, say, in 2019?
Thanks.