I love going out on the tandem with Sleepy...I get to look at the views...keep my hands warm under his butt cheeks...when I am not pinching them.
Due to knee problems, it means I can get to go further than I would on a single, he is a strong rider so makes up for what I lack on the hills and doesn't moan too much if I want to ease off.
I have complete faith in his ability to ride safely...even when we broke the speed limit in France going down a hill very very fast because he wanted to get back for food!
As to long distance touring...would be a bit worried about fitting the kitchen sink on a bob yak....I like some comforts
And of course, not forgetting for some....stoking a tandem is their only opportunity of actually getting to ride a bike in the first place!