Hi I am dairy free and have been for about 6 years now (my LO is fine with dairy though, despite never having any before he started weaning).
There are lots of good dairy free alternatives to most things, I have soya milk, soya yogurts and even soya chocolate. The supermarket has 'free from' stuff so you can even get cakes and biscuits if you want them. I have found some vegan cheese in my health food shop, and although not a patch on real cheese, it's better than nothing.
I also bought a really good cook book called The Allergy Free Cook Book for Kids.
Many babies can't handle the soy proteins either with the CMPA. So there are it a lot of choices for substitutes. And no matter what I try nothing is as good as a glass of cow milk and chocolate cake or milk with my dinner!
I agree no subsitute will ever be as good as a chocolate bar, or some cheese, or a full fat milk latte, or an indian. 6 years without even a teeny tiny bit of those things. I still miss them so much
Oat milk, rice milk and almond milk are great too. I also love Vanilla Rice Milk. The cook book I mentioned is an American one and it has recipes for cakes, so you could still have your chocolate cake as the recipes in the book are free from wheat, dairy, nuts, eggs, soy, fish and shellfish. Here is a link to it:
https://www.amazon.com/Allergy-Free-Cookbook-Kids-Recipes-Allergens/dp/1845433629/ref=sr_1_1?ie=UTF8&qid=1319725764&sr=8-1