Well, KarinsDad, this does shed a fair bit of light on your opinion though. Your definition of "do something clever" is really, "Do something that is not specifically allowed by the rules" and thus anything that is provided for in the ruleset is not clever play.
No. My definition of "do something clever" is "do something clever".
Something that is not done at your gaming table on a fairly consistent basis and that other players at the table would probably not think of.
In other words, clever, unprecedented, exceptional, unusual, atypical, ingenious, cunning, and/or canny.
Not normal, average, typical, pedestrian, or ordinary.
If one considers using forced movement into some type of hazard or disadvantageous position via power or bull rush to be a clever tactic, I cannot say that the person is wrong. Such a tactic might be extraordinary for that person. It seems like this type of tactic is extraordinary for you since you've written so glowingly of it and 4 of your 8 examples used it (although you claimed that your players do these extraordinary types of things a lot, so it would seem that they would be ordinary instead because they are done a lot, but I digress).
I just happen to consider using forced movement into some type of hazard or disadvantageous position via power or bull rush to be a fairly typical and ordinary tactic, one that I have literally seen hundreds of times in 4E.