Er, this vote is so different because we don't automatically get asked our opinion again in 5 years' time.
After a general election, if you are disappointed with the result, you continue to campaign for what you believe in throughout the life of the government- that's why opposition parties continue to oppose and don't just say "Oh, we lost; we'd better agree with everything the winners propose."
Then in 5 years' time, at the next general election, you can review the performance of the government and decide if you want to vote to keep them or to change them.
We're not being told that we can try Brexit and then in 5 years' time vote again based on whether we think it's working or not.
This is, apparently, on a slender margin, irrevocable.