I, too, used to take absurd amounts of ecstasy. When I was 18-19 (I'm 24 now), I used to roll two or three times a week, because I didn't know how absolutely stupid that was. When I was 20-21 I got back into it, and though I didn't do it as often, I did way, way too many pills most of the time, making the hangover so awful that it almost wasn't worth rolling at all.
And all of that ecstasy SCREWED ME. I ended up with a panic disorder so horrible that I literally couldn't leave my house unless I absolutely positively had no choice, and that lasted for over a year until I finally got medicated for the panic. Now I'm panic-free, and I still do ecstasy, but only 3-6 times a year, and never more than 2 pills a night, 3 if they're not very strong.
Not only do I feel so much better having stopped the excessive use, but spacing out experiences by 2-4 months makes every roll so much better, and limiting myself to 2-3 pills pretty much eliminates the hangover. \
From my experiences with the people I used to roll with, and just the clubs we went to where everyone rolled all the time, I've found that a lot of people start doing ecstasy and of course find it fantastic, so they do it way, way more than they should. It takes about two weeks, maybe more, for the brain to replenish the serotonin you lose from rolling, so you shouldn't roll more than twice a month, and even that, IMO, is way too much. I wouldn't roll more often than once every two months, and often I wait more like three or four. But I also believe that if I hadn't gone so overboard back then, I wouldn't have learned from my mistakes, and I wouldn't have the perspective/hindsight to know better now. We all have to learn by screwing up.
But I do definitely feel so, so much better now that I do it infrequently. Doing it all the time made me feel physically crappy, and mentally fuzzy and depressed, not to mention my mouth was always one giant sore from chewing on my face all night. Keeping it in the front of my mind that there are so many bad sides to doing a lot of ecstasy really helps me stay away from it, even though of course sometimes I want to do it every day of the week.
But with any drug (pot being the possible exception), the less often you do it, besides it being obviously less unhealthy for the body/brain, the better the experience is. Doing ecstasy all the time makes the experiences repetitive and boring, and diminishes them pretty severely. Now I realize that instead of having to spend enough money to take four or five pills to get off, I can spend a lot less money a lot less often and have a much, much better roll.