Ahhh but there are some tricks you can use to help things:
1) Early mornings - like many insects bees are cold and very lethargic first thing in the morning; this means that they are totally docile and very easily approached. Many loaner bees even roost up on leaves and the like to sleep so you can hunt around for them
2) Rain - short sharp dips in temperature, like a short rainfall, catch bees out and they will crash down fast as they cool far too quickly. This leaves them trapped and lethargic on flowers and the like - again a great time to take photos.
3) Popular flowers - flowers that are fed from regularly are a great way to get shots as the bees will ignore most else to concentrate on feeding - though can be tricky getting more than their bums in the shot
4) Sugar water (don't use honey as honey from other hives can cause illness and death in other bees) - a good catch all attraction/food source for many bugs - again relying on them being absorbed in eating and not paying attention to their surroundings.