Why thank you for asking!
Because Tomorrowland and Frontierland (and New Orleans Square, Fantasyland, Main Street, etc.) are filled with music, activity and whimsy.
They have kinetic energy like the Rockets Jets, Peoplemover, Big Thunder Trains, Mark Twain steamboat, canoes going by, etc., have themed music playing (ironically Star Wars in Tomorrowland, etc), characters like Woody and Jessie and (again ironically) Boba Fett walking around. They all have a charming and inviting scale and tone.
On the other hand, SWGE is a dull, depressing, lifeless, abandoned movie set with beige bombed out buildings, rusted static droids, and closed doors to nowhere.
The land is a deserted background waiting for the roaming aliens, droids, bounty hunters, and Jedi to populate it and bring it to life. However, they are not there.
The other lands are visual and sensory treats that are only enhanced by the presence of characters, not solely dependent on them to make the fundamental concept work.