One joke the cast members had was that with each park Disney seemed to care less and less about what how the cast got in.
Magic Kingdom: park in a remote, backstage lot, take a bus backstage into an underground entrance, arrive to your land through underground tunnels. NO entering another land under any circumstances while in costume.
Epcot: side (but still fairly distant) lot, walk in through a low-traffic area side gate; walk to your area onstage, but WS cast must stay in WS and FW cast must stay in FW (fun fact: my girlfriend worked WS carts and I occasionally worked Future World carts, so a few times we both decided to work carts on the WS-FW bridge so we could hang out together at work)
DHS: drive in through the same entry plaza as guests, but park in a designated parking lot section and enter through a side gate, mostly invisible to guests; walk anywhere onstage to your location
DAK: park right next to guest areas, walk directly in front of guests through the front gate, no restrictions on how much costume you're allowed to wear, walk anywhere in the park to your location
It's an often-overlooked but (IMO) pretty significant area where Disney has let their standards slip over the years. They used to place much higher priority on where cast could and couldn't be seen.