Sproul is not a full preterist. He's partial-preterist, amill. He believes the "rapture" is a future event. IIRC, he also does believe that there may well be increased persecution and tribulation prior to Christ's return, in which case I would have to say that his view could be categorized as post-trib with respect to the rapture.
I do agree that there is potential danger of an escapist mentality in the pretrib view, though I certainly know some pre-tribbers who have a more "proper" mentality about it. I do know from personal experience though that when I held the pretrib view I tended towards a more escapist/alarmist view.
Ultimately, while I do recognize the importance of eschatology I tend to spend more of my time on other subjects. I don't think it's a trivial matter...it's obvious that one's eschatological views can have a huge impact on the rest of their behavior and mindset.
It sounds like we're not that far apart eschatology-wise in the broad strokes, though doubtless you would find some of my views on how certain passages go together extremist. I know what you mean about escapism/alarmism; I went through that phase too (I blame the Clinton years). I just grew out of it, and never considered premill itself to be at fault; it was just a Christian maturity thing for me.
I think it's probable that the 70th Week will occur in my lifetime--I also think it'll be a few more years down the road, and we've all got work to do in the meantime.