I tried RV touring. Really enjoyed sleeping in my own bed, eating in my own kitchen, and still traveling. It was great. Now, at $2.50+ a gallon, too expensive.
Then I started backpacking. Saw incredible, beautiful things. After a few hundred miles, walking through "green tunnels" of brush, getting eaten by bugs, and getting a bit bored with it, I stopped (moving from the Rocky Mountains to Ohio helped that too.)
Then I tried car touring. Spent a few months from Ohio to Alaska and back. Great time, cheap gas, but the world flies by in a car. I'd see bicycle tourers on the ALCAN and think, "Wow, now THAT's travelling." They amazed me.
Motorcycle touring was next. Uncomfortable and coupled with all the isolation and the fast-pace of a car. The worst of all worlds it seemed to me coupled with the greatest danger factor of them all.
SO... I feel like bicycle touring is perfect. It's slow, like hiking. You get to enjoy rolling into little towns and then rolling away like in a car/RV. You're accessible; people come up to you. You're in the elements like a motorcycle and hiking, smelling the smells. There's still camping involved like backpacking, but a shower every other day is possible.
That said, I haven't done it yet. Getting my daily commuter fitted with a rack, some motorcycle saddle bags to start, and heading out for 3-4 days to see what happens. I feel almost like, after all these years, it picked me. Does anyone have an interesting story of how they came into bicycle touring?