I live here and have only flown from LAX, Long Beach, and Burbank. There is a saying locally "You really love someone if you drop off or pick up from LAX."
Seeing as Anaheim is in Orange County, expect it to take about an hour or so depending on the time of day to get to
Disneyland from LAX. Rental car outlets require a shuttle to lots offsite from the airport so they take a while to get to.
Often LAX is a necessary evil due to the sheer number of flights going to and from there. Plan plan plan! I'd suggest if renting a car maybe take some time to check out some L.A. sights prior to the drive down the 5 to Disneyland. A lot of you folks gain 2-3 hours with the time change so grab a bite to eat somewhere touristy or check out the beach. I also highly recommend a stop in Long Beach or Huntington Beach because there are some great spots along the coast to grab a bite to eat. One I recommend is Habor House Cafe in Sunset Beach.
https://www.harborhousecafe.com/