I'm the opposite. I used to surf and have only recently been bitten by the windsurfing bug.
My surfboard is now gathering dust but looks like i will break it out this week

Once you get to a competent level surfing is one of the best feelings you'll get.
Taking off, gathering speed getting under the lip and standing tall in a barrel is the best thing i have ever done. never get tired of it.
I am getting that sort of enjoyment now from windsurfing though. The thrill of launching of a wave or dropping into one is very similar.The best thing about it is time on water though.
Personally i use surfing as meditation or therapy. Time in the water is always healing and that time alone to think and just appreciate where you are (surf trips) is priceless.
To me windsurfing is more of a sport and exercise which no doubt i thoroughly enjoy, it' just a bit less "spiritual" for lack of a better word.