Ugh, I always use the minimal UI so I don't have to see the extended launch page already. If it's slow to load because of a bunch of community stuff that will be annoying, especially since Steam sometimes gets broken where nothing on your profile and no community pages will load at all until you totally restart the client.
And in addition to all that, I don't want to see any community screenshots when I launch a game because of the troll spoiler risk. It's already annoying that they got rid of the old single click store link from a friend's right click menu, and now you have to jump to the community page, wait for it to load, and THEN jump to the store page.