Personally I haven’t. While Linux is imperfect, choosing the right distro makes the rest of the experience straightforward. And with it’s whole complexity, I find Linux more user friendly than Windows. Even driver issues, broken shadow file ownership and KDE specifics only made me more confident about my choice to use Linux after I solved everything.
I mean i’m currently in a learning process with Linux, i would like to be a power user like in windows, but i’m just not yet. I don’t know if i would say disappointed, but i tried to use KDE first and would say my experience was rather bad, it was a bit buggy here and there and i didn’t found out how to fix my problems. I’m surprised by it because i though i would like KDE for sure more, but i’m happy i switched to Gnome. So as the op said, part of the experience is choosing the right distro or in my case desktop enviroment is part of the experience.
Sure had few driver issues, or installing japanese was a bit of a struggle, but i have fun solving problems.
Every couple of years I give KDE Plasma a spin, and I’ve found it disappointing every time. Nothing terrible, just a lot of tiny bugs and inconveniences. I find it strange that it gets recommended as a beginner DE so often just because the layout resembles Windows a bit more. Gnome is so much more consistent and aesthetically pleasing… not that I use it, but it’s always my strong recommendation for beginners.
Good luck on your Linux journey!