But I'm stuck -- I exclusively use 'tagged' email addresses when giving anyone my email address, so every incoming message is addressed to "myusername-sometag@domain"... and gmail, of course, uses a + instead of a - for doing that kind of tagging. So if I tried to migrate hosts, literally none of my incoming email would arrive anymore.
Sucks that a decision I made before gmail even existed now restrains me so much. :/