@chitterz Yes, It might be a issue if you don't use it properly. One way to limit distractions is by subscribing only the required channels. Don't spend your time on the home page rather visit only the "My Subscriptions" page.
@arsen_batyuchok I don't know if I have one yet. I use so many and my brain is spinning from them all. Currently have 70 tabs open, and they're all in use. Some are personal, and some business.
When I read the question for the first time, I somehow got it as "Single most USELESS app of your life", so the answers seemed confusing. :D However, now it makes sense, and I should say that I can't imagine my life without Google. :)