While it has its quirks, overall it hasn't been disruptively annoying or infuriating so far, just minorly so.
The taskbar in a distinctly Apple-esque way has the icons horizontally centered by default. The calendar opens only on your primary monitor in a multi-monitor setup (a particularly trivial habit to be forced to break).
My only real (and slight) annoyance, which I address here, is that good old MSPaint has been replaced with a more frills tool, Paint. If accustomed to the old school tool, you may as I did find yourself aggravated that the workflow is a step or few more convoluted for the kind of elementary stuff you might do.
By elementary, I mean stuff you want to do in the second or few you're accustomed to. Yes, there's the snipping tool, yes, there's Photoshop and Paint.net and myriad others, but no, this is about MSPaint, damn it!
Complicating this is that I lack admin permissions on my work machine. That means installing Classic Paint and pretty much anything else is a no-go. However, I found a workaround.
My first attempt involved trying to use the mspaint.exe executable from a Windows 10 laptop. To make that happen, I took a copy of that file, renamed it to mspaint.txt to avoid triggering any potential email filtering, and emailed that roughly 917KB file to my corporate inbox.
From there, I saved the file to my Windows 11 machine, then renamed it to change the file extension from TXT to EXE, and tried running it. However, that yielded "Unable to create new document." I know Windows 10's version of mspaint.exe had a few changes since the Windows 7 "era", and likely some dependencies tied to Windows 10 itself, so this wasn't surprising.
Notably, however, despite Windows 11 being locked down by group policy and antimalware measures, it didn't balk at attempting to start up its older Microsoft-published cousin. Anyway, out of sheer laziness, I then did a google search for web servers with directory browsing enabled using the following criteria:
"Index of /" mspaint.exe
That yielded among others a site down under in Australia somewhere that hadn't bothered to lock down their folder structure hosting an earlier version of the file, this one a mere 335KB or so.
That file I poached and went ahead and uploaded here. Those wishing to verify it's safe can run it past VirusTotal, but as far as Microsoft is concerned, it ran without a hitch.
Count on Microsoft, Inc., or any other corporate entity in IT to inflict the maxim that time marches on upon its users, by periodically and irrevocably changing things up in often annoying, inconvenient, arguably unnecessary ways.
That's perhaps the one constant right behind change itself in the industry today.