We find the portion sizes to be fine, not to big, generally not too small. We only do Disney on the
DDP, and we generally grab an app too. We don't share when we do our TS (we only travel as two adults and we find it tacky for us to split one dish at a TS), but we do trade bites here and there so we can sample what the other got. We do share our CS meals, but it has nothing to do with portion size but with the fact that the number of places we LOVE to eat now exceed our CS credits and we refuse to pay OOP, so we split our meals so we can hit twice as many places. The only exception is Earl of Sandwich because, well... I love their sandwiches. He can eat his own damn sandwich. LoL!
The only time I struggled a bit with the food on the DDP was during the DDP golden days of each person getting an app, an entree, a dessert, and one specialty non-alcoholic drink per credit. That's not to say I didn't eat it all, just that I struggled...
I agree with the previous posters who said that some people can be pretty judgmental about other's dining habits. There are times when I say that I think the portions are fine for one while others split it that they give the "Well WE don't do the DDP because WE don't eat THAT MUCH. I don't know how ANYBODY could eat that much food..." It's the DIS backhanded way of saying "Hey, make sure that you stop when fork meets plate, Hogzilla." My personal favorite is "I could never do the DDP, it's just so wasteful." And I'm all over here saying "Well I'll take their DDP portion, I can put it to good use..."
I used to get really irritated by it, go off on the "I'm 5ft 7 and 130 pounds and a size 4, I run 2 miles a day and go to the gym 6 times a week, I'm hardly some shut-the-buffet down garbage disposal who expects huge portions and demands tons of food" rant, but in the end, whatever. So you want to order a dish and share it 15 ways and be glad you didn't waste food, overeat, overindulge, or spend a lot on food. That's not the vacation I want. I like food, I love the DDP and how it allows me to eat a ton of it while not breaking the bank (I can't afford to eat like this at home, physically or financially, so DDP is an awesome fit for us), and personally, if at some point I'm not riding through the Mexico ride repeatedly groaning about how full I am from dinner at San Angel, then honestly, I feel like I've done something wrong. And I'm not even joking, I know that I can eat to the point of stomach explosion at San Angel, but then, if I ride Mexico twice, Captain Eo once, then Living with the Land once, Nemo, then maybe Spaceship Earth, I can do a lot of sitting, still be entertained, not have to walk far... And by the time we get off of Living with the Land, I'm not feeling disgustingly full anymore so I can hit up Club Cool, and by Spaceship Earth I'm ready for some tie dye cheesecake.
That's a great evening for me. Check that, that's a perfect evening for me.
The only time I made a food choice I regretted at Disney was a 2:30 lunch at Le Cellier and a 6:30 dinner at Whispering Canyon. Now
that was too much food. We ate to the point of fullness at Le Cellier and weren't really hungry for Whispering Canyon, but the food looked SO GOOD and we took the all-you-can-eat thing as a command and not so much a courtesy... Dear God, we wanted to die. But we still got through two skillets (we had to if we wanted to try all the different types of meat) and all of dessert. We didn't eat until noon the next day, though.
On this last trip, I did break down and grudgingly share with my 2-year-old, but only because he was so stuffed on snacks his grandfather bought him that I knew he wouldn't eat much. Otherwise, I'd have relegated him to his own plate with his own meal.