I've done the walk many a time, and it's a pleasant walk (takes about 10-15 minutes, walking at a not-slow-not-fast pace) so long as you take the shortcut
The shortcut being:
Start out on the corner where the hotel is (Katella &
Disneyland Drive). Cross the street to walk up the right side of Disneyland Drive, toward the Park. This area has a nicely landscaped walkway that's further away from traffic than a normal sidewalk. When you get to the Grand Californian Hotel, follow the signs (They will have an arrow that says "To Disneyland" next to them) through the lobby & out the doors to DTD. From there, just follow the flow of foot traffic into the Park. Easy, and alot more pleasant than walking down Katella, up Harbor, etc...faster, too
You may want to take the ART bus (Route 9) back to the hotel at night, as the walk back can seem very, very long at the end of a day in the Park.
Personally, I wouldn't drive to/park at Disney from the hotel, as parking's free at the hotel & costs about $14 at the Park.
Any more questions about Stovall's, feel free to ask...I've stayed there more times than I can count!