Most arguments about wait time are conflating two issues: how long from when you check in to when you see the doctor, and how long between when you try to make an appointment and the date of that appointment.
The US system is not terrible for wait times on appointments, and depending on your type of insurance it’s not terrible to see a specialist. But there are some niche practices that are horrible wait times, such as endocrinologists.
The US system “solves” the office wait time issue by dinging doctors for spending more than 7 minutes per patient.
Not for long.
https://www.vice.com/en/article/wxje8n/researchers-use-ai-to-generate-images-based-on-peoples-brain-activity