Each case IS different. Boarding a plane behind a slower than me person is annoying possibly, but it does not impact me in any real negative way. Deplaning is a far different story as there may well be good reasons for people to have to "run" off the plane. I walk as fast as I can (for that short distance up the jetway) but along the sides, using the handrails as much as possible. Feel free to pass me by! Holding up a line in PreCheck is just plain annoying but could also be very detrimental to others behind you.. Did you not realize you were flying today? Why did. you put stuff in every single pocket you have, Why did you were that enormous belt buckle/jewelry/boots? Did you not realize you cannot take liquids through security? OMG.. Again, you have no idea what other persons schedules are, maybe they had a flat tire on way to the airport and are desperately trying to make their flight, or maybe they were actually prepared to go through security and can breeze through in seconds flat and could enjoy an adult beverage in a lounge prior to their flight. What bugs me is people that stand (and block) in the midst of the concourse, chatting on their phone, looking up flight info, or playing games. Why not move to the side?