If you want no foot traffic, then charter a jet all to yourself with no attendant. Even then, you might still have someone from the cockpit walk into the cabin. Of course there will be foot traffic regardless where you sit in a commercial flight. Just because you are up front and have less pax doesn't mean foot traffic is nonexistence. And certainly the foot traffic on the 77A F cabin is more noticeable in the right isle as oppose to the left isle since you have four seats going in/out from the former while you have two seats going in/out from the latter, hence why many people prefer A over D/K, including myself.