It depends on the contract but a queueing strategy is a definite part of the overall strategy of almost everybody I have traded with. I certainly use it.
Basically, if you've got some decent levels that you want to potentially get in at and you're early enough in the queue, you have the luxury of letting that order get filled and having the time to assess whether you really want that trade or not without getting shafted. Obviously sometimes the market will go straight through your level and make you look stupid but if you know what you're doing and can read flow, a high percentage of the time you will be able to scratch the trade before it trades past your price. This is all good and well but if oyur commissions are high, you might use this idea a bit more sparingly.
Scalpers and position traders do this- it's all about identifying a level and making sure you get filled at it and/or have the time to change your tune.
The value of doing this does widely vary depending on what contract you trade (with Euribor you'll probably be spending all f*cking day in some kind of queue, in FX you've got to have a high risk appetite to be calling tops/bottoms) but everyone with a brain queues up. On the flipside, daytraders need to be wary of the inevitable bullsh!t information that is offered to you by watching queues. Anyone who has traded for more than 5 minutes has been subjected to and must learn from flipping/spoofing if you ever expect to make money. It's because so many people were successful (going back a couple of years) by analysing queues, that people like Paul Rotter have created an edge that they can exploit. Assessing queues now is as much of a skill in itself as trading by using ta/fundamentals. I'm assuming you are quite new to trading so this might not make sense now but you'll figure out what I am trying to say with time by yourself...... or you'll go broke without knowing why.
Looking at the idea in a broader, more objective way, if you're dead certain about a move and you want to be involved, then you should at least have the confidence to hit the market rather than waiting at one price above/below. However, it depends where your stop + pain threshold lies......
At the end of the day, like every decision in trading, you need to use your own initiative and experience to decide which tactic to use. You might be queueing all day at one price for a trade you may/may not want to execute when the market gets there whilst hitting the market whenever you see fit inbetween. You have to figure it out yourself.
All I will say is make pretty damn sure you pull all your orders before NFP...