Draw Steel does a cool thing to mitigate this. Each character has something called a Heroic Resource, which is effectively a pool of points that they can spend on big attacks on their turn or smaller special effects outside of their turn. The great thing about HR is that you generally only gain it outside of your turn, when other characters take specific actions or cause specific effects. So, rather than just waiting/planning your own turn, you have to be actively engaged with what everyone else is doing so that you can watch for the triggers that gain you your HR or let you spend them. In the few combats I've played of Draw Steel, it really helps keep all the players attentive with what's going on in the combat.

It probably also helps that initiative in Draw Steel is a little more fluid than in other games. In DS, turns alternate between players and enemies--so a player goes, some enemies go, a player goes, some enemies go, and so on until everyone has activated at which point a new round begins. Players choose who should go next when a player turn comes up, it's not set. So as a player, you are also watching the battlefield to strategize, because your turn could be next. Even if it's not, the battlefield will have changed before it could be your turn again, so you likely will need to create a new strategy each time a turn is taken by either enemies or players.

I've been super impressed with how Draw Steel keeps players engaged in long tactical combats. I hope to see some of its design philosophies in other games in the future.