One pet peeve that gets to me is something that's done on a lot of commuter railways and S-Bahns, the 10/20 minute schedule. The schedule looks like:
2:10
2:20
2:40
2:50
3:10
etc, when it should be like this:
2:10
2:25
2:40
2:55
3:10
This minimizes waiting and allows for frequent service every 15 minutes..
What are your pet peeves?
Transit stops that are actively hostile to people wanting to use them. Removing shade/shelter/benches and generally making them unpleasant as possible. They always says it's to "save money" or "improve safety" but it's always clear it's to prevent people who are homeless from using them for the smallest bit of comfort.
Recently they started renovating transit stops near me to remove any enclosed warm places (important when it regularly reaches 0°F or colder) where someone could wait, and it's not unusual to have 15 minute+ waits.