More granular data:
I'm very particular about the way I use things, and am usually at least a little bit scared of change. I'd say I had a longer adjustment period to Mastodon (two weeks) than to Linux Mint (three days).
Sure, I'd love to have all of my years of customisations, but I also don't miss the accrued clutter? In many ways it just feels fresher.
And holy shit, my not entirely new PC feels brand new! Everything is so fast!