Thank you, everyone! Great responses!
I am really trying to visualize my life 20 years from now, or (god willing) when I am elderly. Do I want to have a massive Vitamin regimen? No... For me, another concern is having to stay more strictly away from carbs as a DSer. I'm a lacto-ovo vegetarian. While I can follow a reasonably low carb diet with ease, I can't do an extreme low carb diet because most of my veggie Protein sources also have some carbs (exception of eggs and cheese, but I wouldn't want eggs and cheese to be basis of my lifelong diet).
I have to try to not get caught up in the evangelical DS culture. They make some great points, but some seem to have blind faith in their cause. Some are quite militant about pushing their surgery of choice.
I'd rather end with a BMI of 30 and be able to take just, say, 4 Vitamins a day and eat my normal healthy vegetarian diet (just in much lower quantities) than have an end BMI of 22 and have to take 30 vitamins a day and subsist on eggs, cheese, and maybe even have to start eating meat to keep my protein levels up.
Also, it seems many that have the DS see it as a bonus that they don't absorb much fat calories. That means they can enjoy lots of butter, mayo, heavy cream, etc. But to me, that isn't a bonus. I've never ever had a taste for high fat foods. So what some people may see has the best part of a DS diet, I honestly just see as .... well, "ewww." LOL!