Yes, I really like this combination and sometimes also add some cucumber so it is not so dry.
Peanut butter goes with sweet and savoury - I often use it in cooking chicken), and also bananas are the same - I use them in cooking and also in salads as they are sweet with no added sugar and give a nice texture to crunchy salads.
Put the two together and it is a great "marriage"!
My husband loves this combination, and apparently he has been eating banana and peanut butter together most of his life. I don't even want to think about these two together, but it takes all kinds to make a world, doesn't it.