I'm glad you had a good experience.
The doc measured the esophagus in case there is a need for surgery in your future. If it wasn't long enough you could need either extensive mediastinal dissection or a Collis gastroplasty.
I wonder how the doc determined from just looking that the sphincter was weak?
I've done several endos, with and without meds. I have such an awful gag reflex that without just isn't fair to the doc. I refuse Versed and Fentanyl - one just makes you forget, has nothing to do with pain, the other makes me vomit for hours even with Zofran. I get only Propofol, wake up with my mind intact.