Yes, South Dakota was/has been definitely better.
In that time frame in my area of MN, it was big news if a farmer spotted a pheasant during harvest. I didn't travel as much in that time frame because of my growing family. Early to mid 90's was the peak for my area. Now if I go just to go out in Mower County where I grew up, I'd still be lucky to see one hen. The land has been stripped of all fence lines, sloughs, and wood lots. There's state land with great looking grass but heavily pressured. Hell, the deer population has shrunk quite a bit.
I just returned from 3 days +1 washout from East central SD and we took 93. Easily saw 500. 15 guys was the most we had in the field. Yep, a lot of guys. Its a yearly get together of friends. No limited out days but our group has some guys who couldn't hit the broadside of a barn, guys who were there for a day, guys who are just there for the social side(only days they handle their shotgun), and about 4 guys and 2 teenage boys who you would call hunters. 6 dogs, 3 aren't very good or even a pleasure to be around. This was private and public land. 100% wild. No pay to hunt. We have averaged around a 100 for this October trip for the last 4 years.
YMMV