Yeah, I do enjoy that dynamic between them, and that episode is ok, even though gimmicks are generally my least favorite. Lisa is my favorite character, and as a group I probably like Lisa episodes the best. I kinda have a crush on her, even though she's 8 years old... and doesn't look human... and is a cartoon.
On a related not, Lisa the Greek was a little too... harsh, I guess is the word. The one where Bart shoplifted had that feel too.