Brides feet are usually covered by their long dresses. Does the fact you're thinking of something to the knee mean the dress is not floor length? Have you considered dance shoes? They are usually pretty comfortable. "Character shoes" have a heel, but the base is pretty wide so you're not so likely to fall over. Square dance shoes are usually lower.

What's a wedding wedding?

As to noticing women's shoes. You might not notice them, but I bet you notice the ankles & calves. The higher heels make the ankles look slimmer & legs just look nicer. Low is comfortable. When women wear slacks, they can wear shoes that look about like men's. They are comfortable & rarely noticed. They'd look awful with a skirt.