Disney suggests 90 minutes to make sure that you will get there in time. I usually suggest about 75 minutes, but it is always better to be safe than sorry.
Wouldn’t you rather wait at the park a few minutes extra than miss out on park opening or a dining reservation? I would.
Also, make sure to take into account the time it will take you to get through security. Every bag or baglike item will be checked and everyone goes through the metal detectors. This should be part of your planning.
If you choose not to take the busses you can Uber, Lfyt, Use the Minnie Vans or Taxi.
Travel safely and enjoy the ride.