There are extinuating circumstances such as the intank pump. That I can see. But if you don't have it then IMO you don't need it. You are one of the very few who have actually noticed an improvement by running it and I'm wondering if there wasn't something else there that was causing your problem.
On a VP truck though you don't need to spend the money and the hassle on it unless you have an intake pump. Maybe on a wicked high hp 12v or CR you might need one but I'd say under 650-700hp you'd be doing just fine with the stocker.
Also, let's not forget that any pump is doing it's max gph at all times regardless of whether your at WOT or not, the pump is pushing everything it can constantly. So whether at idle or WOT your pulling say 150gph constantly.
Also, a LOT of people have had issues with not getting the hose cut right or the right length and run into running out of fuel at a 1/8-1/2 tank. That's an awfully big risk to be taking. Not to mention that the fuel sending unit on these trucks is kinda delicate anyways and can be broken very easily and I don't know about you but I don't like messing with delicate, expensive to replace parts unless I have to.
Not looking to start anything here either. Just facts from my experience and with talking to people.