I've found that if you tape the spots of your feet up that usually get fucked up first, the tape reduces friction-hence, no blisters. If im walking it wet terrain, having good socks as well as tape worked really well. If im walking in rocky/dry/hot terrain where my feet are sweating a lot, the tape does tend to roll but I would rather retape every 6-8 miles than deal with a blister. ....Just what I have found. Also the smart wool socks work great.
Yeah... I'm going to have to agree with Hitman on this. I've never seen rigger's tape on feet come out well. Good boots, good socks, and conditioning is the only way to go.
(Telling the story because it fits...) Many moons ago, when I was a young and good-looking gunnery sergeant, I had a Marine falling out of a hike at the three mile mark. I get up to him (yeah, I was screwing around in formation, one of the bennies of being a gunny

) and give him the "WTF is your problem" speech. Turns out someone had convinced him that the best way to prevent blisters (and this idiot was a corporal) was to rub your feet with vaseline, then put plastic bread bags over your feet inside your socks. I have NEVER seen feet that messed up... Moron...