Large blockers that are difficult to damage are boring to play with, and frustrating to play against. Some examples…
Consul’s Lieutenant with Gideon +1
Knight of the White Orchid
Undergrowth Champion
Not only are the creatures very difficult to kill, but they also make it extremely difficult to damage the opponent.
I suggest changing the rules of the game so that a creature can only block once per combat. Defenders would block first, then vigilance creatures, then reach creatures. This makes it possible (though difficult) to kill a person that is hiding behind one of these very large creatures by swarming.