The success of a front end team (and therefore, the success of a GSTL) can largely be summed up by whether you're meeting your metrics or not. Are you meeting your REDcard goals? Are cashier speed, cashier friendliness, and other front end metrics from the survey green? If so, then as a GSTL, you're going to be left alone (unless you get guest complaints, can't speedweave, etc.)
But whether you're making your metrics or not is entirely dependent on your team. Have a good team that makes their goals? You'll have a good time. Have a team of bottom performers? Then you're stuck either working with them to get them to improve, or starting the long process of performancing them out if they're beyond saving, all the while having to answer to your ETL-GE hounding you.