Not in my experience. The boat is a pretty active, highly dynamic place, you need a good grip, either on the boat to steady yourself, grabbing/working with lines (ropes) or working the winch handles. We wouldn't use it if it were greasy. EVERYBODY in the fleet uses coppertone sport spf 50. About six years ago I noticed that big box stores have started offering generic version in a similarly sized/shaped blue bottle, but can't confirm it's the exact same formula.
It might be greasy for the first 5 minutes while it dries/cures but after that you don't know it's there. We usually reapply every 3-4 hours as we're in direct sun for 5-8 hours typically
Comes in both lotion and spray types. Seems like spray is more popular on the east coast for whatever reason. Almost exclusively sold as a lotion in Texas based on my personal subjective experience.