With 16% haste total:
GCD = 1.3s
MF = 2.586, .862 per tick.
4 GCDs and 2 ticks of MF = 1.29 + 1.29 + 1.29 + .862 + .862 = 5.59 seconds.
Pretty damn close with next to no haste. 16% haste is something like 7.5% haste from gear. Look at something more in the norm like 12% haste from gear, which is 21% haste raid buffed. GCD is now down to 1.24, MF is down to 2.48, or .826 per tick. You're now down at 5.37 for the sequence.
That's a stupid amount of haste right there. All 393 rating of it.
I don't disagree with the intent of your posts on the matter, but the exaggerations are not going to help anyone.