I live in the PNW but manage to make it to Colorado 3-4 times a year to bash ice or hike the hills. This subject has come up a few times ( My son-in-law is from CO) and it seems like ( not to cause any one distress) there are more "recreational" climbers in Colorado, which is a good thing. That is also not to say there are not hard core climbers in CO ( I climb with a couple of world class climbers from CO) and I have seen my share of climbers on Hood, Adams and Rainier that should have stayed home. The joke on that one is that you can go to REI in Seattle or Porland, rent your boots, spikes and axe and within 2-4 hours be hiking to your death.( Yes I know, A fairly sick joke) I do think climbes can get in over the heads faster here than in the Rockies, or maybe it is just that since we live so close to Hood ( listed as the most dangerous mountain in the lower 48) we hear about the problems more here than we do from Colorado, Although you guys had a bad year in the Wilsons a couple years ago, so getting into trouble is easy to do anywhere.
I think the easy access to climbs and the trail/climbing information supplied by places like 14er.com help introduce more people to "climbing". I have run into several climbers who offer "advice" about the route and sometimes it is almost a direct quote from 14er.com. Thats my reasoning for the larger number of "recreational" climbers, I have run into a number of "first timers" in some fairly rough place in CO and they were pulling out printed route descriptions from this web site. We have a lot of hiking trails with lots of hikers but once you hit the brush the number drops off rapidly.
Th PNW has long approaches, Olympus is 24 miles ONE WAY, the TH are snowed in till mid july so if you go earlier the approaches are even longer and rougher. The down climb is often worse than the up climb, I never count the climb done till you are standing at the TH parking lot. The elevation gains are high, even 9000 ft peaks can have 6K-7K foot gains. And a lot of the climbs are remote, I have been out 2-3 days witout seeing anyone, get to the summit and there are 6 guys who came up a different route, you shoot the breeze a bit and then head back out and see no one for another 2 days.
I have a friend who was climbing in the Northern Cascades, had a 3 day approach, did the climb, hiked back out and once they got home realized they had not climbed the "right" mountain, so route finding can be a bit sticky sometimes.
Drives to climbing areas can be long depending on where you live and where you are going, in 7 hours we can be at Mt Shasta or southern BC and during the climbing season we are putting a lot of miles on the truck just getting to the TH. There are lots of multi day climbs that are logistic exercises, lots of two day climbs and lots of 12 -20 hour day climbs( I do not like sleeping on the ground so would rather go like crazy for 16 hours and then go home to sleep)
I would guess that once you get to a certain level, climbers are about the same, I would agree our back country / expedition skills may be a bit better ( we have to be good or you never get anywhere and in some case you cannot get there from here or from anywhere for that matter) I am not so sure about the technical skills, I suppose it depends on what skill set you are talking about. As someone said, a lot of solo climbing is done and your tecnique has to spot on or else. I would say that if it were not for my ice and rock climbing my rope skills would be lacking as I climb a lot solo ( not by myself but unroped from any climbing partners, at times it is faster and may not be any less safe)
I think there is a difference but it may be due to terrain and conditions, we have learned to cope with what the mountains give us and have developed the skill sets and experience to hopefully deal with them.
I do enjoy climbing in Colorado, and even on the "tougher" climbs I feel more relaxed than I do on a lot of climbs at home, not sure why that is.