Well for starters they can identify if anything is wrong. A qualified and trained person might be able to spot something that could be a red flag to something else. Something that looks minuscule could cause something horrible, or has been caused by something bad. Something that someone with a trained eye can see. A good vet would know what to look for.
Secondly, if they spot something that requires immediate attention, or even a quick fix, then the tools necessary will already be present.
Of course if nothing is wrong, then the OP will have peace of mind, and a good health report for her snake. That's never a bad feeling.
So...
I had a BP who wouldn't eat due to stuck eye caps and I was not confident enough to cotton swab them off.. I already tried soaking and it didn't help.. Even tried the towel trick.. I gave up and let the vet do it... A few days after the vet got rid of the caps, my BP ate a mouse, and has not missed a meal since (this was back in 09). My point is that if the OP doesn't know exactly what to look for, or just isn't sure of what could possibly be missed, a vet trip is NEVER a bad idea. No matter how small or big the problem is...