I boot my A2000 for several hours once or twice a week depending on what I am interested in working on.
Lately, it has been for setting up a Kickstart 1.3 system with an old 2090 controller and Miniscribe 20MB MFM HD. I like the old OS's the best, writing mountlist entries, ARexx scripts, searching through mountains of FredFish and AmiNet collections looking for tools and utilities.
I use UAE here and there, mostly when I want to mount a SCSI HD on an old Adaptec board I have in a spare PC and set it up for my Amiga without messing with floppies, ADF's make less of a mess.
After decades, I am still surprised by what the Amiga can do, and there has never been a time where using the Amiga wasn't fun.