My last 4 vehicles was a Ranger (5 years), another Ranger (5 years), A Lincoln LS (6 years) and a Fusion (7 years).  Neither of the Rangers ever went back to the dealer.  Neither did the Fusion although I did replace one door handle myself ($60).  The LS only made 2 trips for various minor things. 
  
My wife's last 3 vehicles were an Expedition (6 years), an Aviator (4 years) and an Edge (5 years).  The Expedition had one repair (coil pack).  The Aviator had several issues including a new engine head.  The Edge hasn't had a single issue. 
  
So yes - I do believe you're in the minority if you've had that many vehicles with more than 4 visits during the ESP period.  And just think if every vehicle was like yours - Ford would be losing money hand over fist on ESPs and they'd either raise the price or stop selling them.