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I've always been annoyed by how icky traditional sunscreen makes me feel, so I was happy to find out that there's a roll-on sunscreen that works reasonably well. I've used it a couple of times now, and while I wasn't outside for long enough that I would have burned when I used it in either case-- and therefore can't comment on the effectiveness of a single layer of the stuff-- I would say that applying it was much quicker and easier than applying traditional sunscreen. While applying sunscreen isn't the lowest hanging fruit in health interventions out there, it's still useful for reducing one's risk of death from melanoma (yay for living longer!).
Sunlight increases risk of melanoma but decreases risk of other, more deadly cancers. If you're going to get, say, 3 times your usual daily sunlight exposure, then sunscreen is probably a good idea, but otherwise it's healthier to go without. I'd guess a good heuristic is to get as much sunlight as your ancestors from 1000 years ago would have gotten.