I shoot a lot of transparency film, and don't have or use a meter.
Apologies for the image quality and 35mm... I don't have a scanner. But just as an example this scene is not so straightforward as mid-day sun on your front lawn. Once you've got an eye for it you can figure it out, most of the time you just need to consider the deepness and contrast of shadows for a good indication of how bright it is. A meter becomes more handy the duller it gets, when you can no longer rely on shadows to give a good indication of the light.
I would not however advise anybody to not have a meter with them. When you need it, you'll really need it. But your eyes can be pretty darn accurate for most situations.