The ones like Dennis, yes.
Did you see the quality? Henry does great panos too, If I recollect
As for technique, I find it very easy. Most of my panos are hand held. I use MS ICE (free software)
and you can use couple of paid software or the latest CS. I think the key is either to be in A mode
or manual. You don't want the focus or DoF to change between shots and try for at least 25% if not
more. The tricky part is to keep the camera level horizontally. That just sums up my technique.
Some of my examples ( I need to update with latest one) are in my flickr album here: https://www.flickr.com/photos/bigsur/sets/72157631792722195