Yeah. And, to me, this sounds like, "My players are thinking tactically, this feels like 4e."
And my thought is then, "What, your players didn't think tactically in 3e? What game were you playing that I wasn't?"
I can't speak for others than myself, but I have an idea what it might be...
Tactics in 3E were ... well, maybe not tactics at all, and more like strategy or logistics? Working out which buff spells t use and when, how to max out on the different bonus types (and avoiding, but definitely accounting for overlaping modifiers). In an individual encounter, you mostly looked at what short-term buffs you still need to cast, and then you play your script -tripping with iterative attacks to either gain +4 to attacks or force the enemy to provoke an opportunity attack, power-attacking the right amount when you could guesstimate the enemies AC (or not doing it all) ,the occassional cleave. Cast low level offensive spells like Magic Missile when everythnig seems find, maybe the occassional conditional buff to thwart a death effect or charm/dominate, pull out bigger guns when it seems neccessary.
Tactics in 4E are much more movement focused and depend more on the environment. You can have a ledge or a fireplace in 3E and 4E, and in both games you might be able to push the enemy onto. it: But it's far more likely to happen in 4E, because if the enemy isn't already adjacent to the ledge or fireplace, you would need to spend multiple turns with bull-rush in 3E, and you lose all your damage doing so!
Also, somethinglike triping or disarming in 3E? If you can do it, you can do it every round, and it migh be the best choice to do so in 3E (and if you don't have the right feats, it's probably a bad idea and you should never do it). In 4E - only some of your encounter or daily powers can do it - so you must choose when and where, and then have a good chance of doing it.
That said - 5E stil has the "always on" aspect of the weapon masteries, so for me, it might not be that close to 4E yet.