It’s marginally useful, but it also is extremely slow to roll out given the extremely limited range of the cell towers (at least the ultra high speed ones anyways).
Personally I have it turned off on my device, there’s not enough of a noticeable benefit and a non zero hit to my battery to have that part of the modem turned on.
I have never ran into anyone anywhere, cyberspace nor meatspace, who has claimed that 5G was actually useful for something.