The biodome is not a zoo, and it's not quite a botanical gardens.
We came this past weekend and found the longest line I have ever seen in my life. There were people everywhere. The line went all the way around the biodome, to the theater, then back again. We had paid for a taxi there, so we had little choice but to wait in line. It moved fast-ish though, I'd say we were outside for about an hour.
Once we got in I realized why there were so many people there - it was free day. So the good news was that there was no charge, the bad news was that because it was free there were thousands upon thousands of people there. Many more than I am sure is normal.
Antarctic area was closed, so that congested the people even more and it was not at all an enjoyable experience. We were just a body of smelly humanity that surged forward en masse. There was no space or time to enjoy any of the exhibits.
But what am I going to do? Ask for my money back?