I've not noticed anything. Granted, a manual will always be more "snappy" simply because it's got a direct connection. I'm also assuming that F-150 was a V8. That's a huge difference. You have my cylinder pulses to soak up more fuel on throttle changes at a given RPM, resulting in a quicker spin-up (of course that could be countered by less reciprocating and rotating mass in a V6) - anyhow...it's more than likely the transmission that's throwing you.