I dive without a snorkel - ditched it because my hair kept getting tangled in it. I tried carrying a fold up one and it got in the way or unrolled on its own in the water too many times, so I gifted it. My husband has insisted on always diving with one until recently. On our last trip it detached from his mask - can't figure out how. Someone in our group found it and returned it, but when he discovered how nice it was to dive without it getting in the way he became a 'no-snorkel' convert too.
I like the idea of having a snorkel. I just don't like having to carry one. If anyone has an idea for one that is easy to carry and use I may reconsider as I know they're useful in some situations.