I'm using Laravel Valet for my Craft development environment (which is awesome, btw) except for an issue with Tasks not kicking off. I initially stumbled upon the problem while using the Import plugin. The task created by the plugin would never start. Instead, it would sit in a "Pending" state.
I figured this was a bug with the plugin, because other tasks seemed to start and run just fine. I then also discovered another task-related problem with P&T's example task plugin, "Power Nap", where running the task would cause the whole site to hang.