I've never been through any classes, but I've done a bit of sailing with friends.
If you just want to shit-n-git, sailing probably isn't for you.
If you usually have limited time to get out on the water and get wherever you're going, sailing probably isn't for you.
If you don't like being reliant on good wind conditions, sailing probably isn't for you. (well, there's always the motor...)
Really, as impatient as I can be at other things, sailing (done right) actually works for me.
When we go, we don't pick a destination, just a general direction. Whichever way seems to have the best wind will do. Sometimes we have to motor a bit, sometimes we just drift... but when you catch a good breeze and get the sails trimmed right, there's nothing like the feel of it. You're not going to outrun powerboats, but unlike them, you can actually have a conversation without shouting.
So, there's my endorsement. I imagine the classes will be in small boats with no motor, but if you decide to acquire one for yourself, get something that either has an inboard or that you can slap on a small outboard motor, Sail when the wind is good...but no need to worry if it's not.