I do not have any children of my own, but I have 11 nieces and nephews and have probably spent more time with children than many parents. I hope that God will bless me and DH with children soon. I hope to take them to Disney World numerous times, and we will do the shows and rides with lines, times and intensities they can handle at their relevant ages.
I second you on this. I am the oldest of over 20 grandchildren

, and the youngest in our family is currently 10 months old. We are now in the grandchildren/greatgrandchildren stage in our family, we still have a young uncle adding on to his family, and us grandchildren are now adding. Having said that.....
Over the last 10 years, my grandparents have taken the ENTIRE family

to Disney four times. At no time that I was with any of the little ones, would I have dreamed of leaving my better half in line to take one of the kids to go to the bathroom or entertain them. I would have been frustrated after having waited for 30 minutes to have to leave a line, but kids needs come first over an adult being inconvenience by having to start the wait again.
This last trip, the older teen-ish kids in the group had to deal with the whole last day being about little Garrett (18 months) who had spent the week just doing what everyone else was doing. After it was explained, everyone was cool. While we spent some time in each park trying to get what Garrett missed, if the older kids wanted to do something in that park, we split up.
Now, I don't think you should avoid Disney with little ones. We went at the end of June

, so it was hot, humid, and the 4th of July crowds were arriving more and more each day. I would not trade anything for the look of wonder on my little niece's (only 6 months old then) face at absolutely everything. Would I take her back during the same time at the age of 2? No way. I would hit the less busy times, so we wouldn't have to deal with super long waits, and she can still stay on her schedule.
When we were little, there was a six year difference between me and my younger sister. When I wanted to ride something she couldn't, someone would take me on, and someone would stay off. An inconvenience to the non-riding adult, yes. But that is what being a parent is about. Putting your kids needs first. But don't ask complete strangers to put your kids needs first. Most have their own kids they are keeping busy while waiting in the long line.
Tip for the OP...when we went to the AK, we were there at opening (missed rope drop due to an emergency diaper change when we got off the bus). When we went into the park, everyone was heading towards the Safaris or EE to get FP or to get in line before the line got crazy. We steered away from the traffic, headed towards Camp Minnie-Mickey and walked right into the first show of the Lion King.