I’ve also been a Gnome user for a while, but i am looking forward to plasma 6 as well. I highly doubt I’ll make any sort of switch, but I’ve never had a good time running plasma 5 so i would love to like kde more. Wayland by default is going to benefit gnome too since it’ll put more priority on bugs and lack of support that is still somewhat common among the less desktop-tied apps.
(My Plasma 5 woes have been on multiple devices, multiple times over multiple years, with and without basic customization. i was basically never able to go a day without some sort of major shell crash. I got way too familiar the the command sequence to restart the desktop ui)
I do find KDE to be a bit info dense and it doesn’t look like 6 is changing that aspect of things (at least by default), but it does look a bit less busy at least. I also never like basically anything about classic windows UI, layout, or task flows so KDE leaning into those just doesn’t work well for me. That said, while i like gnome being more minimal, i do wish it had a bit more capability to expose hidden/nested options more easily than requiring extension installs.
I’m similarly excited about cinnamon 6. A bit unfortunate (and understandable given its goals and usage share) it is still X11, but there’s a lot about it that demonstrates a solid middle ground between gnome and KDE.