It's ubiquitous in my work. I don't know how we would conduct the experiment we currently run if there was no plastic - e.g. here is my colleague in his plastic waders, cutting the plastic tubing that delivers the solutions to be dripped into the plastic flumes in the river. Each day I come with my plastic bottles to collect water samples from the flumes to investigate the microbes. The DNA which I extract is of course stored in plastic tubes.
TNchicks PhotoHunt has a great collection of different plastic photos.