WRT Nick Arcade, I vaguely remember being told that teams were either directed or just figured out themselves that you weren't supposed to direct Mikey to the goal, because that way you hit more squares on the board over the course of the round. Since they moved him to the goal when time was called anyway, there was no reason to do it yourself.
Anyway, my proposed changes:
High Rollers: If a contestant has an insurance marker and makes a bad roll, they turn the marker in and the turn ends there.
-OR-
High Rollers: If a contestant passes the dice and the other player makes a good roll, the dice immediately pass back to the original player and we keep passing back and forth until the game ends. Either way, there's less incentive to pass at the first sign of danger.
Monopoly: Questions are done in the style of Split Second, Countdown Round. Last correct answer collects each monopoly in sequence. Property collection now gets done in eight questions instead of 22+, and we get to spend more than 90 seconds going around the board.
Friend or Foe/Golden Balls/Any show with the Prisoner's Dilemma gimmick: ditch the "Split/Steal" mechanic. Replace with Rock-Paper-Scissors. Both parties split the pot if the throw is a draw; otherwise resolve as normal.