It helps, but it's not necessary if you can plan it out well. Use the meals for hopping if you have hoppers, or stick to everything but Jiko. Jiko is the only sig not in a park that doesn't have super convenient transportation to a park. (Granted, it was also my favorite last year, so may be worthwhile to spring for a cab if you don't have a car).
I'll typically use the resort meals (sig or non-sig) as hopping points. Instead of going from Epcot to MK on Tuesday for example, I'll be heading from Epcot to The Contemporary for dinner at CG, then from there to
MNSSHP. I pretty much follow the same pattern with all my resort meals. (Well, after Mom leaves on Monday at least).
Of course, this only works if you don't feel you have to "freshen up" before dinner. A change of shirt and a quick splash of water to the face works for me, but your mileage may vary.
Example (not all sigs, but the same thought process can be applied there):
Thu: Driving to Jiko (Mom arrives by car around 5:30pm)
Sat: DHS -> Poly (Kona) -> CSR (via MK)
(Mom leaves Monday evening)
Tues: Epcot -> CG -> MK
Wed: AK -> Sanaa -> DHS -> FF -> Epcot
Thu: MK -> GFC -> Epcot -> Le Cellier (ok, that one's in the park)
Fri: AK -> Citrico's -> MK