I've used blindfolds and had them used on me. As a ler, I don't mind them but find it more fun without. As a lee, being blindfolded does at least seem to extend my ticklishness a bit.
(Although I can tell you that "lose one sense, the others get sharper" is bosh. If it were true, I'd be a LOT more ticklish than I am. It's the element of surprise that makes a blindfold work.)