I avoid rush hour because people are annoying. I usually have no issue with bringing my bike, most of the times there are a few bike areas on each train and when it's 5 instead of 3 while people can still pass the hallway no one would care about it. But it's just as easy to use a bike from NS (national railway), they are at every station and it's cheap. A folding bike is free to take by train, I might buy an electric one in the future.