There are a few different options to choose from when deciding on how you'll get to the parks. The buses are free and will pick you up right at your resort. They run every 20 minutes or so but don't be surprised if your wait is much longer. Buses can get stuck in traffic, wait for additional passengers to board or take extra time loading motorized scooters and wheelchairs.
If your budget allows for it, I recommend jumping in an Uber or Lyft. The wait is less than 5 minutes and the cost are around $8. We saved a ton of time by using Uber and Lyft in the morning and took the bus back to the resort in the evening. If you're looking to take things to another level and have the budget to do so, Disney offers a premium transportation option called
Minnie Vans. They work like Uber and Lyft but are driven by Disney Cast Members. They cost between $25-$45 and can really cut down on the stress.