I thought I'd check back in and say that switching launchers worked fine without any difficulty (so far). With Fosterj's encouragement (thanks!), I tried out my first launcher (Launcher 7, just to play), and was able uninstall it and go back to Android (since this is android, not WP7, there isn't WP7 style through the apps themselves or app-support for live tiles. without that, it's more a novelty than anything).
The one thing that didn't work was home switcher. It kept crashing, and wouldn't let me set a default. I've heard mention of this before, though, so I suspect it has something to do with how Moto does Blur. Switching launchers replaced my home button defaults, but uninstalling got it right back. I didn't try it, but I suspect the settings adjustment in Fosterj's suggested thread would work fine, if I'd decided to keep both.
Looking forward to trying a few other launchers now!