I'm in California and a lot of people here have vhf. They use them on lakes, the California delta, bays and ocean. It's mostly fishermen that have them. They are used for emergencies and also for people the chit chat back and forth usually about the fishing. You can also get continuous noaa weather reports and updates.
If you are going to get one for the boat get a base model not a hand held. Hand held are great but their broadcast distance is more limited than base models. VHF operates on line of sight. The taller the antenna the farther your signal goes and the farther out you can pick up signals. I'd suggest an 8' antenna for the casual boater/fishermen. You can get a ratchet mount for it so you can have it up or lay it down when towing, storing,, going under low bridges or when ever. Most marine patrol agencies such as sheriff, coast guard etc. monitor the emergency channel 16. I have my cell phone but don't leave home with the boat without my VHF.