I don't live in West Seattle, but I can give you a few really good resources to use while you're here. Also, note that the Elliott Bay water taxi has increased it's service to accomodate the construction:

http://www.kirotv.com/trafficflow/index.html

http://transit.metrokc.gov/tops/oto/water_taxi.html

If you're looking for some good eats while you're there too, try:

Blackbird Bistro: http://www.blackbirdbistro.com
Jak's Grill
Mission: http://www.missionbar.com
Ovio Bistro

and if you're bringing your girlfriend, Clementine is a great, funky boutique with items from local artists.

http://www.clementines.com

traffic through "the clog" has not been that bad at all. i drove north through the construction area and it only took like 10 min. not sure if busses are re-routing but if they arent, i believe they have a bus lane (?). but seattle times has been hyping up the water taxi, so i'm sure you will have no problem with that! have a good trip!