A good app where you can schedule appointments sometimes within the same day or often a day or two, a dedication to on-time appointments in the office (I've yet to wait for than a minute or two beyond my appointment time in 5+ years of membership, across different providers), and fast turnaround of lab tests that they run often in-house.

I couldn't possibly go back to the old way of waiting weeks for an appointment and waiting god knows how long once I get there.

EDIT: A have a handful of doctors to choose from here in Seattle that rotate between the offices in the city, along with a bunch of nurse practitioners