I have been to Alaska a couple times, once back in 98' for a few months and then in 2010 for 10 days. I have spent most of my time on the peninsula and I love it there. Amazing wildlife, beautiful country and the fishing has always treated me well also.
From what I know you could spend several life times there and still be entertained.
The thing that keeps me from going back to AK and exploring more just comes with age and responsibility, along with interest in other adventures.
When I went to AK for three months back in 98' I was under 20 with hardly a worry in the world. Three months these days would be a pipe dream, ten days in 2010 was just a lucky situation I am fortunate to be in, but yet far from the norm.
While I would suggest Alaska to everyone to visit their at least once, I personally have been eying endless amounts of other places out there that share in similar but different beauties. With time along with expenses being limited I need to be selective to knock off my 'Bucket List" so to speak.
Now if I were a Gates, Trump or Buffett kid I'm sure things would be different I would likely be up there on a regular basis hanging in one of two small but comfortable lodges with my name on it along with venturing off to Patagonia, Cuba, Costa Rica, Russia, Mexico,45 other US states or so and Montenegro etc etc. Then the detailed areas of course at those same locations, so I would have to go back again and again, but for now I just have to appreciate my surrounding waters being the West is the best and all anyway.
I would ask a similar question to what keeps people from going to Utah to fish, but we already know it is the @#$*% (aka crappy) laws we have here in the state and there are far better places to find your backing, but the fishing doesn't treat me to bad and the beauty here is second to none. IMO
Alaska has not seen the end of me yet I can tell you that... ahh I love that place.