What happened to all the miracles?

I’m preparing a seminar on a poem written by St. Francis of Assisi, and I’m doing a little background reading on his life. Reading about his curing the sick and stigmata got me wondering: What happened to all the miracles?

Why don’t people have visions, get stigmata, heal the sick anymore? Were people in the middle ages and earlier just more ready to accept the truth of these stories? Do we just not hear about it?

From what I know, recently canonized saints (or those who’ve lived more recently) seem to have devoted their lives to the service of God, which I guess is great, but it’s no talking to birds and having oozing wounds in one’s side.

I’m not intending to offend anyone by asking this question. Nor am I looking to be preached at. I’m not religious, and you’re not going to change that. I just want to know what others think about this, because it’s got me stumped.