You can hop from BW to BC/YC.
No you can't. You can hop from Pop Pool to pop pool. You can hop from POFQ to POR. You cannot hop from BW to Y&BC or from Y&BC to BW (even DVC members cannot hop to SAB from anywhere). You cannot hop from FW to WL.
My budgeting do -the dining plan can be a good deal - IF you were going to eat table service every day anyway. In the days before the dining plan, budget boarders seldom ate sit down meals every day - over the course of a week they'd have one or two.
You CAN eat cheaper than the dining plan through a combination of counter service, sharing at sit down meals (does everyone need their own desserts) and bringing in some snacks. This may not work if your DH eats like a linebacker, but for anyone who is used to a USDA serving size to start with, sharing will provide enough food.
Budgeting DON'T - if your party is made up by one person with gastric bypass, a sixteen year old on a perpetual diet, and a seven year old who likes KRAFT mac n cheese and survives Disney on two chicken fingers and some fries every day (from the McDonald's cart - any other sort of fries are gross), don't expect the buffets to comp your meals or charge you less. If you choose to go to an all you can eat character meal or enjoy Biergarten, be aware that you aren't likely to eat enough food to justify the price - but the photo with Mickey or doing the polka might be worth it anyway. (Sometimes - infrequently - there are stories of the waitstaff taking pity on the family that has someone that doesn't eat at the buffet - but its rare and not something to be expected).