Sorry for reviving an old thread, but I figured an extra opinion wouldn't hurt.
Also, first time poster (but not new to internet forums), so be nice.
Anyways, I find it best for me to keep my highs 'fresh' and powerful by cycling between smoking devices and by keeping them clean. I've found when the resin builds up in the pipes and my slider piece it is harder to get a good clean hit through them. I don't smoke resin, so I make it a habit to clean them out every time before I smoke, that way I make sure I can get the best hit each time I light up. Also, I change out the water each time as well, and try to use cold water or pour in some crushed up ice cubes along with the water to keep it nice and cool.
Though, I think everyone agrees that those massive hits which make you cough like a mofo gets you high as fuuuuck.
My roommate and I make it a habit to cycle between our several pieces. We are both fans of smoking out in nature (Colorado front range area), so we'll leave our bong or bubbler at home and take out our little glass pipe or a small jade piece we have. Convenient to carry around, and the clean mountain air is wonderful to breathe in along with some potsmoke.
edit: My roommate and I also smoke sometimes daily, but sometimes we will go a week or two without smoking when we run out of pot and don't usually have time to locate some more (we work long hours, and nightshift). I think the most I've ever smoked was 3-4 bowls in a day, and it's not really worth it for me.