Yes, it is common and safe at controlled fields because the tower controller is watching your six.
No, no,
NO! The controller does not have your "six." You have your six. See and avoid. Not controller-see-and-you-avoid.
Your responsibility, your life.
Unless I can assure that final is clear and will remain so, and unless I have a strong reasonable expectation to be going quickly, I don't accept a position and hold. I've seen traffic cleared on top of me too many times, and on others too many times.
Treat being on the runway like a loaded weapon. Weather you're taxiing on it, positioning to hold on it, landing on it, or taking off on it. When you're in position to hold, you can't see behind you, and you may well have traffic landing on you. A common clearance is position and hold, with traffic behind you on the approach. You're expected to be up and gone before the other traffic arrives, but what if you're not? It happens. All too frequently.
Never rely upon the radio to find traffic for you. That includes the fishfinder in your cockpit. You find traffic. Don't let the controller do it for you, and don't rely on the controller to prevent you from having a traffic conflict. We partner with the controller in many cases, and there are certainly times when we can't see and avoid traffic due to visibility, clouds, darkness, and speed. But we put ourselves in that position when we could otherwise see the traffic, by assuming the controller will "keep our six" as we position and hold.
While admittedly an aside, I'm always amazed by the pilots who won't turn on all their lights any time they enter a runway environemnt. I turn on strobes, taxi lights, landing lights, recognition lights, logo lights; whatever is out there to turn on, I turn on. Let the world know I'm there, and I'm not proud about it. Landing traffic or departing traffic might miss me, taxiing traffic may do the same. I want to be seen. I've heard too many misers out there who tell me that they don't need a landing light for takeoff in daylight, or for landing in daylight in VMC. The strobe ought to be enough. Or don't need the strobe. That's what the beacon is for.
It's a big sky, but a small runway. All the traffic in the world is headed for that runway, that same small bit of concrete. Better the devil you let them know you're there, and don't occupy it for any longer a time than you need. Whatever you do, don't ever assume that the controller has your "six," especially while sitting on the runway awaiting a clearance to do something else.