If a mission has Dil as a reward, cooldowns keep players from farming dil by repeating missions ad nauseum. (Free dil = free Zen if it's not controlled.)
I hear you. Some mishes are pretty simple to complete, too.
Queues and mishes are kinda two different animals. I mean, queues are pretty much *designed* to be ran multiple times due to you need a stack of what they reward to get what you want.
Queue cooldowns also aren't hard to defeat if your purpose is to farm dil. All you have to do is rotate toons into and out of Crystalline Catastrophe (the queue that is always full and takes ~ 3 minutes to complete) and you can nonstop farm 720 dil. If you want an easier version that even your level 10 toons can do - Repeat Romulan Minefield into infinity. It takes longer that CC but it's... level 10, and, no cooldown. Yup, it's 'only' 480 dil but it's not a very long queue to complete and you can start running it on the first day you start playing even if you didn't make a Jem-Hadar (that starts at lvl 60) and even if you only have 1 toon.
As far as that goes.. It is so easy to farm dil in STO.. All you have to have, is... time. The more toons and time (and the lower the boredom threshold) you have.. the more dil you can get. If you want Dil, just do some 30 second mishes on multiple toons (research lab.. contraband..). It's not hard. It just takes a small amount of time to warp from here to there and to click some buttons.
But the various activities that offer it, and the small amount that most give you, it wouldn't be a huge crime if something that issues 200 dil for 30-45 min of play isn't cooled down anymore.
It's 480/720 dil for queues, and, some of them take 3 minutes or so and some take 20 or so. You can already farm a 3 minute, 720 dil, queue. Now.. If they make.... Undine Assault queues suddenly active by removing cooldowns, you have to play for a good 20 minutes to get your dil, if dil is what you're after. You're not going to do that. You're going to keep doing what you were doing.
Some Rep is harder to get than dil. Queue cooldowns don't really keep people from farming Dil as much as they do, Rep, due to your desired Rep isn't going to be available in every queue (like dil is) and some queues are pretty inactive. I don't want to call them dead - I would just say that their rewards aren't currently as popular.
By removing queue cooldowns in a rotating fashion it gives (more than none) incentive for players to get into allllll queues. Better to have to wait until your queue's cooldown removal day comes than to see the queue you want to be in, dead, allll the time.
*shrug* was just a thought. I don't really see the need for our current queue cooldowns except that they didn't want people to have the (theoretic, based on the queue being busy..) ability to (relatively..) fly through the Rep system to get the gear they want. Some queue's could use some life breathed into them. That's why I was thinking to rotate the cooldowns out rather than to remove them completely. To kinda highlight each queue (or group of queues) and give them a reason to be busy when they might normally otherwise never be.