I agree. Plus it depends on what vitamins you're taking. Some require taking 2 for a serving size. Which case you would be better off with one in the morning, and one in the evening.
Someone said they break theirs in half, most studies and vitamin companies say thats the worst thing to do. Unless its a liquid the nutrients are not split up evenly across the vitamin, you might get all your vitamin C's in one half, and all A's in the next. Considering the recommendatio is that you get a study stream of C's all day this wouldn't be good.
Considering the purpose of Vitamins I would think you should take it with a meal and before your workout rather than after. Vitamin C, E, and a few others are considered to be antioxidants which reduces free radical build up as its occuring. If you wait until after your workout you already created a large amount of free radicals. Vitamin E is dissolved primarily in fat, so a protein, carb, and water shake would make it hard to get absorbed, and vitamin C is supposedly excreted within hours.
Then you have to take into account research hasn't determined if a Multi does anything, so in the end does it even matter when you take it?