^^^^I certainly will not try to talk you into to taking multi. It's just insurance after all and if you don't feel you need it...
As far as absorption, for the most part, they are well absorbed. The reason for the mega-doses in multis is basically for overkill and to make up for some of the competition for absorption. But it's pretty much been shown that, yes, most vitamins and minerals are very well absorbed. That doesn't mean that it doesn't get complicated and some "forms" are better than others. BUT if you worry about all of that then you are REALLY taking multi's too seriously
Basically you take someone with a clinical deficiency not based on some sort of mal-absorption problem or other defect, give them a pill...and bango, deficiency gone. So, yeah, they work if the deficiency is simply dietary.
But if I forget to take vitamins, lol, I don't lose sleep over it and neither should most of us, I don't imagine.