Hi Charlotte,
If you are driving your own car and you arrive early at Disney's Hollywood Studios, Epcot, or Disney's Animal Kingdom, where you park will not be much further away from the theme park turnstiles than where the Disney buses would drop you off.
With the Magic Kingdom, however, you're definitely going to want to ride the Disney buses. The parking lot, in this case, is very far from the front of the theme park. In fact, you have to ride a monorail or ferryboat from the guest parking area to the Magic Kingdom. The buses, by contrast, drop you just to the right of the entrance of the Magic Kingdom. That's definitely the way to go!
As for a character meal with Phineas and Ferb, we haven't heard about any plans for one. However, I would love it if someday we could dine with this imaginative duo. I just love them! Meanwhile, spin on over to Epcot and work with Agent P to foil Dr. Doofenshmirtz and his evil minions at
Agent P's World Showcase Adventure.
Thanks for a fun question!
Jill