Jamie,
I'm not sure how much you "see" of the golf course when you were busy qualifying for the US Am, but the two most offending trees on the left were removed two years or so ago (you can see their shadows in this picture). This, along with one of the tall trees on the right just off the tee (more should follow) allows a precise draw to cut the corner leaving a short iron to the two-tiered elevated green surrounded by terrific bunkers. From the My Home Course write-up:
As for opening up the view of the green from the tee on 15. That sounds like a good idea, but there are so many trees between the tee and the green on the left (some of which as Mike Malone suggested are needed as the 18th green and 15th tee are so close together) that it would really be taking down trees through which Flynn carved out hole corridors in hardwoods. There are a few holes at RGGC where the greens cannot be seen and would be better to cut trees down. The evergreens on the left of the 2nd hole for instance would be better off cut down to reveal the green. The fifth green cannot be seen, but I like the uncertainty standing on the tee. Twelve needs two more fir trees to come down to really open up the green. Two were taken down and it has helped expose some of the green. Thirteen is another hole with a blind tee shot but it works really well that way. Seventeen has a sharp dogleg around a grove of trees so the green cannot be seen.
There was talk of putting trees back in on the left of 15 fairway (ill-advised, but Jim Nagle seemed to sway the group once and for all), probably as a result of the trees cleared on the right side in the rough between the landing area and the stream. It is a much more interesting visual from the tee and hopefully will result in the fairway being widened towards the creek thus bringing the stream into play.
The other area of offensive trees (more visual than limiting strategy) are the rows of evergreens between the 11th and 9th fairways and between the 9th and 12th fairways. These along with the arborvidae around the ninth and twelfth tees ruin beautiful views and create slow-downs in play.