We've never done an interior room, so I can't comment exactly, but I will say that on our oceanview cruises, we've often enjoyed looking out the windows from our room. Our first cruise we booked that since we were worried an interior would induce claustrophobia, but now even though I don't have that worry, it's hard for me to imagine a cruise without the ability to look out the window from the room. But, when we did the Alaska cruise, we found we were usually out on the top decks when we really wanted to look around. It's not as though your only way (or even the best way) to see the scenery is from your room (and, most days weren't actually that scenic - really just the glacier day, as I remember it, and we wanted to spend as much of that time on the top deck as possible).
I expect I'm in the minority on this, but I'll disagree with an earlier poster about the balcony rooms. We've only tried one once, and it was on a Caribbean cruise, not Alaska, but we found that we never really used it, and it certainly isn't worth much of an increased cost to us over an oceanview. I will agree, though, that I think you'd find that there's less concern about kids on the balcony once you see it, so I wouldn't really let that be a major reason to avoid it. But,, since your cruise is supposed to be a relaxing time, if you think you'd find yourself more stressed/worried due to having a verandah, then just avoid it.
OK, one last thing - that I'm sure puts me even more in the minority: we are totally fine with the tiny mini-portholes on Deck 1 of the Wonder/Magic. In fact, our next cruise booked is just that: a Deck 1 Oceanview on the Wonder! I know most people prefer the large window on other decks, though. The curtains do keep out light well, but I'll say that if you really want the room to be able to block outside light, the mini-portholes are real portholes - you can actually swing metal closures over them (which I expect are watertight if fully fastened)! So, if you really want to keep out the light, those rooms are great for that.