@ZaO.
One reason for my drive bay scheme is, actually, hassle avoidance. But in a different context.
My perspective is backup, and system recovery. To my mind, while both virtualisation and dual boot both have their place, they also complicate full system recovery, especially when different file systems are involved. And yes, there's ways round it, but I've had issues in the past with both.
If you are repkacing the entire drive, however, then when running, whatever the system is, it is natively and purely that, without either dual/multi-boot complications, or virtualusation, to complicate things.
One more thing. Remember I said my bay thingy was four-bay? Well, not only can I physically change boot drive, but also physically change data drives, while still having one spare bay. So, it's dead easy 'ghosting' a full system 'recovery' drive, with the beauty of not even needing to reload the image. I just change drives.
I can also duplucate data drives. Or install drive four, copy backup data, and remove drive four. There's other options to that route, too, but you get the idea.
I take the point about not wanting to reboot regularly, though. I tend not to, though. I settle in for a session, and rarely need to reboot within, because what I boot dictates which drive I boot from.
Oh, and on reboots, ypu'llmdo exactly the same amount of rebooting if you go dual/multi boot.
One more thing. This route does require some money up-front, for the bay(s), and drives, and the time to physically install the bays.
But .... you power down, remove your boot drive, install this drive bay, put your boot drive back in and your system is EXACTLY as it was before you started. You haven't had to much about with drive MBRs installing dual boot, etc. You've done NOTHING to your current drive, other than boot it. And because you do nothing to it when installing Linux, or whatever, on a second drive, then as long as you power down any extra drives, nothing you do with experimentation can affect your 'live' drives. And that, by the way, is why I bought the multi-bay drive thingy - quickly and easily removing/protecting 'live' data drives.
Anyway, suit you or not I put it out there. It's one way, as they say, to skin a cat. Not the only way, though.