I've got to agree with Juggernaut. Similar to him I have been working side by side with PAs my whole residency. In order to be able to bill for the PA there has to be "no qualified resident available for the case." That's a direct quote that goes into the operative dictation/note. At my institution that is generally before you become a PGY-3, but in some instances that persists after this point based on an individual resident's competence... or lack thereof. If you wanted to get more hands on you had to prove your competence both intellectually and technically. Some attendings are more prone to being hands off than others, but as time has gone on it's been nice to do cases with just me and the PA- knowing how that relationship will work once I'm in practice.
I have found many of our PAs to be great resources for education. The way our program is set up, having the PA actually facilitates our education. I'm not going to lie, there was a learning curve because most of your exposure before residency is standing 3 deep in a case, so holding a retractor is how you felt like you contributed. Once the PAs and residents came to the understanding that we were there to learn to be the surgeon, and they were there to be the hook holder/assistant, things went more smoothly. Each year, with new residents unaccustomed to this type of education, there is a similar learning curve. It has made all the difference in the world.
It was better early on when they would help us more with floor consults and things, but overall we work well together and help each other out. We are lucky in that they take the floor call BS at night so that we can focus on the ED/Trauma stuff. It's a great way to learn!