The parking right by the night market grounds is $20, but there is parking further out (about a 10 minute walk) for $10. You can even find parking for $5, but that is even more of a walk away.
It was my first time at the T&T Waterfront Night Market, but I have been to the one in Markham before. I felt like it was exactly the same- still crowded, very long lineups, strong stinky tofu smell, etc.!
I recommend going to the stalls with long lines. There is a reason they have long lines! I ended up getting food from a stall with absolutely no line and it was awful- we threw half of it away. Also, you don't get very good value for your money, but that should come as no surprise.