I went and bought some Tamiya masking tape just now. I must say, it makes a world of difference. And I don't think it's just a placebo effect - I would say the Tamiya tape masks about three times as well as normal (commercial) masking tape. And then some, even. Being thinner and less adhesive really helps in cases like this.
I've noticed the same thing with a lot of Tamiya modelling products. Their ***35 nippers are the best I have ever bought, and I think they were well worth the $30 some odd I paid for them. I'd tried everything from $7 Radio Shack wire cutters to Xuron and other LHS brand ones, and they all definitely suck compared to Tamiyas. I like them so much I'm halfway willing to get the other two kinds they have out just to see what they're like.