Dechlorinating

[FishGeek]

I have heard from a few people now that they have never used dechlorinator in their tanks. Just straight tap water. Now I was wondering how many people out there do this? Is dechlorinating a mith? Some placebo product put out there by aquarium companies to make money? I talked to people both in Calgary and Edmonton about this.(We have totally different water)
If you think about it, most people put the dechlorinator in and then puor it in their tanks right away! Most chemicals need some time to mix and start a reaction. So urban legend or neccesity?

Simon