All of these night shots are great. Just curious, when were these pictures taken? There is hardly people in a lot of the posted shots; I would like to eventually take pictures without crowds.
One thing to remember with slow shutter photography - people walking in front of your camera mean less and less the longer the shutter speed goes. You can actually make people virtually disappear just by using a long shutter - say 30 seconds. What the camera is doing is opening the shutter and leaving it open for all that time - anything still will be captured in sharp detail...anything moving slightly will be blurred, and anything moving continuously through the frame will be but a faint ghost trail or even completely gone. Since the moving person is only in any given spot in your shot for a fraction of a second, the whole rest of the time the camera is exposing there isn't a person there. So the 29 1/2 seconds of the shot with noone there will 'overwrite' the 1/2 second there was a person there.
So many night shots you see look like noone was in the parks, when often people were there, but you only see them show up in the shot if they were standing still for a reasonable period of time.
Just to give you an example of how effectively you can blur people out, here's a 13 second exposure of the Haunted Mansion taken during the day...you KNOW there was a line there...but they were moving forward during my exposure, and in the end you basically don't see anyone there:
If you look close, you may notice a faint blur or darker area where people would be.
In this one, it's the Liberty Square bridge from the castle hub, in the middle of the afternoon. Hundreds of people walked through this shot, but it was a 30-second exposure, so you can barely notice anyone was there (someone in a red shirt stopped or was moving slow, and picked up a little streak on the left side, and people coming down the castle bypass in white shirts picked up a bit):
That principle is what makes night shots often look so quiet and abandoned. They are often there, but you just don't see them because they stayed in motion:
(You know that place is never empty at 9:30pm, with the dinner crowds!)
Hope that helps explain it a bit!