Virginia creeper is one of those plants you have to keep an eye on and hack back when it goes too far. It grows so robustly because it’s a native plant, and also because it’s a native, the bees love it so much that you can hear the vines buzzing.
They’re after the pollen, as you can see by the green sweat bee that’s completely covered. I think the little gray bee, the one that’s more in scale with the flowers than the bumblebee, is a leafcutter bee, especially since they’re supposedly fond of Virginia creeper. They’re so small, it’s hard to be sure.