I've watched takeoffs before. Most of the time I saw that takeoffs were simultaneous. I guess it's not as dangerous because each pair is supposed to turn to a different direction. I've even watched as we "raced" the plane on the other parallel runway.
I suppose landings are a little bit harder to time to be simultaneous, but there are some that are pretty close.
I remember several years ago sitting at a gate at Terminal 3 in Manila watching the takeoffs on the shorter crossing runway they have there. One plane would take off in one direction and a minute or so later a plane would take off in the other direction.
Apparently they were testing a new routine to try and shorten delays. I assume wind direction was not a issue for that runway. It was interesting to watch.
Our flight took off from the other runway so we had about a 45 minute or so wait in line before takeoff.