I do the same the welcome conference then you set my assistant to attend the rest, they have become slightly less tedious in FM2011 compared to FM2010 but are still repetitive
I try and attend them all, its a good oppertunity to hear of what you dont no whats going on like players who have spoken out without you knowing etc !!
I only Do it on Pre-Press Confrence because it is vital for how your players are going to play In the upcoming match,But occasionaly on the Post Press Confrence only ones that are Important