If the bees have a barrier they must fly over when exiting your yard, they tend to not come back down until they find something that interests them. If your neighbor's yard is not 'bee friendly' (assuming that means no nectar/pollen-bearing flowers, nor water features or hummingbird feeders) the bees will not be seen there. NOt much, anyway.
MOst of my neighbors forget that I have bees until Christmas, when I bring them a small jar of honey. Even the 'bee friendly' ones don't notice them much.