It all depends on what you are planning to use it for. Canon 24-70 f/2.8 L plus 70-200 f/2.8 L - is a typical set for wedding photogs, so yes 24-70 does get a lot of use by pros.
Personally, I would probably get it if i was working primarily outdoors (weddings, social events), but i mostly do studio work at this point, so I have plenty of light and my 24-105 f/4 L works great for me. Frankly, even for outdoor use i might prefer primes over 24-70 (if I have a second body or a second shooter, so I have enough time for proper framing with a prime).