Hrm. Flight booking is ok, but the search optimisation problem is very tedious for anything more complex than a simple return between two fixed places on fixed dates.

Hotel bookings are mostly fine. Airbnb, bookings.com, fine.

But concerts? Concert booking is fucked. It's the main reason I don't go to concerts, I feel like I'm being absolutely screwed over by ticketing middlemen at every step of a horrible torturous process.