We've been to Alaska 4 times now and yes it's a long drive. 5,000 miles from our home just to Fairbanks which is only a short distance into Alaska. Half the fun can or could be getting there and back going either route. But that's only half the fun and sights at most! However, if you take 9-12+ weeks to do the trip depending on where you start and really explore Alaska's many one of a kind features, you'd not be thinking it's anything like Alberta or BC. Even very different than the NW Territories. Northwestern Canada is very nice also but different than Alaska. Anyone can drive the main roads and see the same thing the other's had seen. Explore, explore, explore - get off the beaten track!
There are three Alaska's. The mainland and it's islands, the inside passage islands, and the Aleutian Islands. All 3 are quite different. Too remote in some areas for some folks to make the effort to go there and not remote enough for others. We will be going back again as it's a gigantic and very varied state and it would take more than a lifetime to see it all!
Denali area to us is very nice but less than "hyped" as it's more of a tourist trap nowdays. On very few days each year can the full mountian scape be seen due the vast height and pervasive clouds but we have been lucky two times, enough. We think of Denali as maybe 2% of what Alaska actually has to offer in sights and features.
The best way to see the inside passage is on a good cruiseship if time is very short or with a small RV on a ferry getting off on several places for a few days each. You can only get or see what you seek and go for!