I know that rabbits must have a sense of taste - no, not in fashion (although Calvin always looks spiffy in his chinchilla coat and Jessica darling with her lop ears), but in food. Smell probably has a really big connection to what will taste good to a rabbit and what won't.
However, I can't understand how they can go from munching on fresh spearmint to eating fresh dill. I mean, that's like eating a pickle after chewing minty gum or brushing your teeth. Yuck-o, yet both Calvin and Jessica don't seem to notice anything odd about it.
Remind me not to eat any salad that they toss together ;-)