We took the Disneyland Express bus this year from LAX and it was wonderful. We'll use it again.
For our way back to LAX (or actually, an LAX area airport), we needed another way to get back since we were leaving past the bus' last pick up time. It would be late and we didn't want to have to make a gazillion stops at hotels or homes on the way back to LAX and we didn't want to then find a shuttle to our hotel from LAX. I used a private van service called Zippy shuttle. We used them last year too. They actually came 5 minutes early, the van was clean and they got us back to the LAX area in record time. Cost us $80 plus tip.
You email them for a quote and you usually get a response from them very quickly. After using them twice, I have no hesitation using them again.