That's the one.
Is this the one you're talking about?
I think Dark Crystal should be the first logo to use this one. Either that or TRON? Or The Muppets Take Manhattan?
A quick look at Disney's OTL filmography (thanks, IMDB!) for the 80's uncovers some real gems: Dragonslayer (1981) should already be in production at this time and probably a movie Jim can point to and say 'more of that, please'; Never Cry Wolf (1983), a landmark film that helps change people's opinions about wolves and nature in general (I doubt Jim would be involved with this but I'm sure he'd love it); Something Wicked This Way Comes (1983), the premise of a terrifying circus just screams Henson/Burton.
Then in rapid succession through 1985-86 comes The Black Cauldron, Return To Oz, Flight of the Navigator, and The Great Mouse Detective. I don't know about the rest of you, but I don't think even Jim Henson as Creative Director at Disney can improve that last one, especially Vincent Price's incredible performance. Finally to round out the decade in 1989 is The Little Mermaid and Honey, I Shrunk The Kids.
If Jim's influence can improve the showing from the middle of the decade, I think the 1980s can be a real watershed for Disney as the company shakes itself from its reputation of being stuck in the past. Emphasis on "if". It's not going to be all rainbows and unicorn muppets (or is it unicorns and rainbow muppets?) from here but I think Jim's talent for pushing creative people to push themselves will overall be a great benefit.
I just had a thought: if Henson is busy at Disney, Fraggle Rock might not get made. [insert scary music and the lamentations of children] Then again, if work consolidates in the USA, Jim might not wear himself out so thin trying to commute between three countries like he did OTL.