Here in Barcelona it's great, I really never have to call one. It's always faster just waiting.
At the busiest time it's a bit harder but at that time the ride-sharing services are also overloaded so it's still faster to just wait for a green light (free taxi). We don't get Uber as far as I know but we do have a similar thing called Cabify. But it's useless if you need something quick and they've put the prices up too much. I now only use them for scheduled stuff like airport dropoffs.
At the busiest time it's a bit harder but at that time the ride-sharing services are also overloaded so it's still faster to just wait for a green light (free taxi). We don't get Uber as far as I know but we do have a similar thing called Cabify. But it's useless if you need something quick and they've put the prices up too much. I now only use them for scheduled stuff like airport dropoffs.