Here's my summary of character interactions on my last 2 WDW trips:
Snow White- no line at the start of
MNSSHP
Pooh characters- during brunch at Crystal Palace, all came during the normal course of the meal
Mary Poppins at MK Hub- had like 2 people waiting for her while walking by, so decided to jump in
Donald Duck at Animal Kingdom- saw he had like 2 families waiting for him while walking by, so decided to jump in
Doc McStuffins at Animal Kingdom- absolutely no line while I happened to be at Rafiki's Planet Watch
Mickey at Town Square- FPed on a whim, FP ended up taking ~30 min due to them switching out friends of Mickey and I was getting pretty annoyed. And this was in an indoor building with AC and room to sit.
So yeah... Not a fan of character lines.
I think DLR will be a better fit for me character-wise because of the wandering characters. I'm totally cool with seeing pretty much any character that has little or no line, but forget waiting in a line for pretty much any character.
The only characters I have slotted in for my trip are Mickey and Minnie at their Toontown houses, mainly for nostalgia because I remember meeting them in their houses back when they had them at WDW as a little kid. I plan on going there right when Toontown opens to avoid the line.