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Honestly, I'm like you. I haven't seen many at all. In fact, the only one I saw was at Harris Southwest Hospital. The "contrasting colors" debate could be had about it since it was white on glass, but at least they didn't try to hide it. The letters were easily more than an inch high, and it was plastered right in front of you when you walk through the door in both languages. Missing it would be incredibly hard.
Other than that, nope, I haven't seen any others. Even at my local Taco Cabana, which apparently has a corporate policy about it, they don't have one at all.