I like colemak better than the other alternatives to qwerty because it keeps Q, W, Z, X, C, V in the same place, so the common shortcuts like Ctrl-C and such stay the same, which is really nice. The only thing I'm not a fan of is the placement of K and L, so I've switched them around so the L is back in the same place as in qwerty.
There's this website if you want to give it a try without changing your keyboad layout : https://www.colemak.academy/
As for having to use a computer with another keyboard layout... yeah that's a massive pain 😅 I need to look at each letter before typing. If I make an effort I can remember some of the letters, but not all (I never learned where most were in qwerty anyway). But I try not to remember and I just look, otherwise my brain will get used to qwerty again and once I'm back on my own computer it will try to make me type some letters as if I was using qwerty...
But before switching I was already confused when sitting at someone else's computer because I used qwerty but everyone here uses azerty, which is like if you took qwerty and tried to make it different in massively stupid ways because IT'S FRANCE OF COURSE WE NEED TO MAKE THINGS MORE STUPID AND COMPLICATED THAN THEY NEED TO BE DAMMIT. And no, don't tell me azerty is to make typing French accents easier, it's a mess you can't even type all of them since they don't all have dead keys... on Windows I had to use ALT+number for some accents. Azerty should burn in the darkest pit of hell along side daylight saving time 😡
Qwerty might not be optimal, but at least it makes sense.