It was the same way for me w/ a bike. It was fun 30% of the time, when the ride was less than an hour, the temp was 80 plus or minus 5 degrees, the sky was partly cloudy, and I was in the country (read: not in the city) riding it. The other 70% of the time the thing sat taking up space.
But when compared to a boat.................
Anything with wheels can be enjoyed 100% of the time, anytime you want.
A boat requires water. You gotta get it there. Means you need something with wheels to do that.
You're gonna pull it w/ your mustang?