My experience is similar to Gary's. The three docs (ENT/Surgeon, RO and MO) had me on a bi-monthly schedule for each of them, which really meant, in practice, that I saw one of them every 3 - 4 weeks. This year it is every three months, which means I see one of them every 5 - 6 weeks. Next year it will be 4 months, then 6 months for years 4 and 5, and annually after that.
My ENT/Surgeon prefers the heated mirrors and light to the scope. They can visualize the base of tongue with the mirrors. According to him, he gets a better overall view with that. The narrower field of view with the scope can result in missed areas. He will use the scope if there is a particular area of interest that the mirror shows.
My RO uses what I term sort of an intermediate step -- he uses a rigid endoscope to visualize the area.
Either way, I am confident I am getting a thorough once-over. I would certainly demand the same from your team!