My point is that they are two separate activities. People who say they love dance classes generally don't get told they should road bike instead, because one is not a substitute for the other.

Since you have never tried a spin class, you should give it a shot. They're very fun and motivating.

I'm pretty much allergic to group activities like that so I don't think it's for me.

I'm not saying you're wrong to find the one more motivating than the other, just that not everyone sees outdoor biking as unsafe, and some people do get a really great buzz from it.

Different strokes for different folks...

It's the constant change of scenery, the illusion I'm transported even when going in circles. Although, I'm fussy about cold weather riding, so a stationary bike can be useful.

Yup. And the breeze in my face and the feeling of acceleration.

I enjoy cold weather riding when I actually do it, but I am pretty bad for just not starting.

"Looks nasty out there, maybe I'll go tomorrow..."

If you treat it like meditation, it can be great. You let your body handle the motions, and you can just zone out.