Count on the lowly specialist to disagree, but I would think that spending a couple years enlisted can be very beneficial. Some of the best officers that I've been under we're E-6's before recieving commission. 2 years doesn't seem like a long time to gain experience, and in the big picture it is not. But there are a handful of soldiers in my company who had a deployment and WLC in two years. 2 years in garrison won't account for much experience. But deploying as a lower enlisted soldier before recieving commission will greatly open up your vision on the bigger picture. Knowing the experiences of the men you lead will never hurt you.
Some of the worst officers I have met were prior enlisted. Many really have a hard time letting go of the fact they are no longer enlisted/NCOs. Deploying as an E-4 really isn't going to help as you simply don't get a chance to see the big picture let alone affect it. Maybe as an E-7 who realizes all of the training, movement of equipment/Soldiers ect may help.
Re: Should I join with the possibility of deployment while in college or wait till eligible for SMP?
I've known of one who sways into the enlisted world a bit more than he should. But I believe SPC working in a TOC for a deployment could transition easily into seeing the big picture (I.e we had a pfc who helped author trip tickets for more than one lt overseas consistently for a year). Different strokes for different folks. Personally, in a combat unit we've always put more salt with the prior enlisted officers. Knowing the ins and outs of the little picture (PMCS and refit days, lower enlisted roles in theater, etc.) is nothing but beneficial before jumping into the big picture blind to everything not in a CONOP or on SIPR in my opinion. Getting into the mindset of an officer is dependent on the intellectual flexibility of an individual. I agree that not everyone enlisted could transition well.