Templates, to me, present a fun, interesting hole, that was designed to test some aspect of your game...
For example, how could one get bored of hitting a shot to the right side of a redan, watching your ball roll disappear and roll all the way down by the back right hole location. To me, that shot just doesn't get old, so whether I'm hitting the shot into National's 4th or even any other redan, the shot can always be interesting.
Another greatness to template architecture is variety, similarity and remembrance.
Variety in that each template hole is very much different than its siblings on other courses.
Similarity in that one can notice the same style of hole, strategy, and potentially green complex.
Remembrance in that template holes (and names for that matter) allow the golfer to easily remember the hole after the round.
I also enjoy making sort of a checklist...
Try to play all the redans, biarritzes, edens, roads, alps, etc. and its always fun to compare:
"Oh that alps has a similar drive to this one but the green complex kind of looks like that one" etc.