I think you are making the right choice. The only place my family really misses when we go to DLR is EPCOT. Plus, if you want to stroll and savor and just do a couple of rides, EPCOT is the best place to do that. There is a lot to see through World Showcase. We love Food & Wine, and the PP is absolutely right that you should do it early. It will be very crowded on a Friday night, but will not be that bad at the time WS opens and through the early to mid afternoon. I would suggest getting there at rope drop and spending time in Future World until 11:00 when World Showcase opens. Then you can lunch, snack and drink around the food booths as you explore World Showcase. When it gets closer to evening, you can move back to Future World, or book a Table Service dinner at World Showcase and get out of the crowds. Some of the attractions in Future World close at 7:00, but a lot of them do stay open until closing.
In World Showcase, don't miss the boat ride inside the Mexico Pavillion (3 caballeros/Donald Duck themed). When my daughter was small she would have ridden it all day. There are a multitude of characters throughout World Showcase. KennythePirate.com will have their schedules, so you can plan if that is important. There are some fun entertainment acts throughout WS to watch. If you decide to do a sit down dinner, Biergarten is a really fun place with small kids. They have a German band that puts on a show and a dance floor where the kids can get out and dance during the show. My daughter has ranked it right up there with Princess meals since she was a toddler. There are also kidcot stations. Your kids can get an agent Perry or Duffy bear on a stick to color for free and then as they go to the kidcot station in each country, they can get a stamp from that country. You can also buy a passport for $10 if you don't mind spending the money and the kids can get the passport stamped in each country at the kidcot stations. If your kids are old enough to know Phineas and Ferb, the agent Perry missions in the different countries are a lot of fun. They might need some help if they are really young, but I think DH enjoys it as much as DD. Also if you want an idea of what food and wine has you can see last years booth menus and prices here
http://www.disneyfoodblog.com/2014-...val-marketplace-booths-menus-and-food-photos/
In Future World, Living with the Land is something you will not find at DL. Every small child I know has really liked that one- something about those greenhouses just seems to be appealing. Journey into Imagination is cute. Spaceship Earth (inside the big icon sphere) is fun- a tip is that a lot of people tend to go there first since it is the first ride you pass when you walk into the park, so the line will likely get shorter if you wait a bit. If you do not mind everyone getting sugared up- Club Cool allows you to taste sodas from different countries for free. DD loves that place. Nemo is clamshells like DL's Ariel ride instead of subs- but it is cute. Also there is an aquarium area once you get off the ride that the kids might like. Misson Space- the green side not the intense side- has a Star Tours feel. If the kids are too young, there is an indoor play area where the ride exists where they can play while the parents take turns riding. We do enjoy Test Track but after riding RSR at CA- TT really does seem like the bargain basement much lesser version. Still fun, but nothing near the theming in Carsland. There really is a lot to do in EPCOT for all ages. It has been DD's favorite park other than MK since she was 2.
At MK-don't miss Philharmagic. That is something you won't find at DL. We miss that one when we are at DLR!