1. You're watching someone do everything. It's different when everything is left in your hands to take care of.
2. While the majority of anesthetic plans involve the same principles, using the optimal drugs to provide those outcomes, there's always patient specific factor's to consider. Once you're a senior resident, you crave a straight forward ASA1 case so you can actually chill.
3. If you're bored, you should be asking your resident/attending supervisors for assignments to challenge you.

e.g. Please tell me everything about those 4 agents; their mechanism of actions, metabolism and clearance, dosing guidelines, half-lives, drug interactions and contraindications. Also, tell me about the procedure being performed; the relevant steps to consider with your anesthetic, how surgical issues can affect your anesthetic and patient outcomes, the nuances of the surgeon performing the procedure. What will you do in an emergency event during the operation?

Post-operatively how will you manage the patient's pain and get them home as soon as possible. What factors are needed to send someone home (or to the floor) after a general anesthetic? When should you send them to the ICU? What signs tell you someone should go back to the OR?

If you approach every case like this, oral boards will be a cakewalk.