In response to people explaining why they "sub"...
If you have an actual mail client, it's really easy to have forum notifications filtered into their own folder, keep your client running all the time, and just look in that folder when you want to see notifications.
Now you have something almost idential to using the "show new replies to your posts" feature, except you don't have to post "sub"s, AND you can easily turn off notifications on any thread you've lost interest in.
And you can still check it 75 times a day if you want to, and you can even check it at the same time that you're visiting the forum.
Please forgive the preaching, I understand people prefer different things and that's fine. I just feel bad for you all and wanted to help.
Your "subs" don't bother me in the least; I actually think they're kind of cute.
By the way, I probably wouldn't use the email solution if I were on Windows, where there is no way (that I know of) to put the mail client on its own workspace (so it doesn't clog up the task bar all the time). I also wouldn't use the email solution if I used webmail, because then keeping it open all the time would (again) be a nuisance by clogging up the browser's tab bar.
If you have one of these "problematic" setups and you use the forum A LOT, it may even be worth changing around your "setup." Especially compared to having 2 accounts, or having to delete your posts! Doing it my way makes using the forum a pleasure, and I can only imagine the other way would be a huge pain in the ass.
EDIT: By the way, let me point out that if you are using webmail, you could get an actual mail client and separate address that is *only* used for getting forum notifications. Pretty painless.