I used to think the same too, until I put high quality large bookshelf speakers as my surrounds instead of the lousy ones I was using, it was then I realized I really was missing a lot. Unless you watch mainly drama or comedy, there is quite a lot going on in the surrounds, especially complementary to the front lr that may not immediately be localized, and while there is no need for them to be large floor standing monsters, a high quality bookshelf speaker that is worthy of being used as a front L R set is definitely ideal. The same should be true for the center channel, where over 60% of the movies sound, including effects, is mixed into.