I don't know if it's nostalgia or maybe I secretively love science, this place never fails to disappoint. I've been visiting this place on and off for the past 15 years, from child to adult. I used to live just in the neighbourhood and we often had many field trips there. I was an odd child and a whole day was not nearly enough to explore the building.I used to love the Rube Goldberg ball machines. I also love the path right behind the museum which leads to a hiking/biking trail that can take you close to downtown. The few revisits that I have had recently were just as fun. My friends and I had a blast and spent the entire morning and early afternoon looking at the exhibits. My favorite was the one about truth which did not appeal to me as a child so I got a chance to rediscover the area.
I can't say anything about the parking situation or IMAX because I've never used either them but I would say that having more staff for little presentations or demos could make this place more interesting. I don't see as many of those as before.