The type of soap has a lot to do with this too. When I used Optimum Car Wash, I'd have to do a decon with Reset at least once a year, mostly in the Spring. Once I moved to Meguiars Hyperwash, I've never needed a decon wash. I'm testing out 3D Pink now, so we'll see how it does.
You'd be surprised how many people don't know the difference. In casual conversation I've mentioned touchless washes with people and I get a blank stare followed by a question of what that actually means. We have a few in our area, but people don't know/care to figure out the difference. Funny observation. In the depths of winter when I use touchless wash places, I'll stop at a place right on my way home from work. It has two traditional brush bays and one touchless. Often the line for the brush tunnels will be be off the lot onto the street. There will be little/no line for the touchless bay and I'll pull right up.