Pat,
When was the last time you played WFW? I'm not looking to pick a snit with you, but your perception of the 15th's tee shot as well as the possibility of flying it into the greenside bunker on 6th seem antiquated.
The present configuration of the 15th has the left shoulder of the apron on the far side of the creek at approximately 300 yds from the tee and not as pinched by white stakes (unless brought in further at Open time, Matt??) or trees to the right side as you suggest. (most of the Sugar Maples are on the tee side (about 250yds) of the creek and the White Birches on the far side are clumped farther right at 275ish, with a single large American Beech at 320ish). The collar of rough that extends from the uphill fairway down to the creek is traditionally about 10-15yds at best. Thus, they don't face having to clear the creek by "50yds to see the green" as you suggest. In fact, the fairway is considerably wider across the creek and unless the USGA narrows that, it will be a definitel target for those looking to make a move or having supreme confidence in the big stick. The green is elevated, but quite visible from the beginning of that side of the fairway. Additionally, most pros will have little problem visualizing an uphill shot to horizon-looking green with a PW in their hands. They'd rather have that than a downhill lie and a 7-8 iron, don't you think?
A high and straight, power-fade (commonplace to most pro's quiver of shots) might even work with 3W, let alone a driver. Also, the hole is one of the few that enables the spinning wedge a chance to get close to a front-half pin.
As for #6, no high rough (as Matt aptly points out will likely be the norm all around but the front opening of the green) will be of ANY aid to any shot on this hole. With possibly the narrowest green on the course, a player cannot afford to miss the chance to apply some spin to their wedge. If the pro's ignore the smart safe play short and left, then those that find the long greenside bunker on the right will be thankful, but using it as a target would be a legal definition of attempted suicide.
Besides, if that's the target, than the player can certainly have little fear of blasting it over the creek on 15.
As for wind.....if it arrives in June (when typically it does not...just the humidity) it will ususally come from the SW in the am and swirl around to the NE in the pm off the nearby LI Sound. Thus, the winds might be expected to be in the face of those early players and at their back later, however absent any cold front approaching, mid-summer winds are slight at best and not usually much of a factor so deep on the West side of the property. There are still large corridors of trees in and around these holes and often a bit more critical to the stretch of 8-9-10 where the property starts to come back into the open exposure. Also, #6 is near the lowest points of the property and thus just a bit more immune to the wind than other holes. An abnormal cross wind will be way more hairy for influence over any approach shot.
Pat.....you and I can go on for a long time about this, but I grew up looping on this course and have the experience of seeing just a few shots shy of Neil Regan over time (and PS....Neil is about the only person here on GCA I'd defer to on describing strategy on WFW).