I just did this exact thing a week ago. Changed from 34/50 to 36/52, keeping the 11-28 cog set. Changing the rings was dirt simple; 4 Torx screws had to be removed and the rings lifted over the pedal. You will have to lift your front derailleur a bit to clear the bigger chainring, possibly add a link to your chain and maybe even tweak your indexing to get everything back to smooth shifting.

Did it change my world? A little bit.
Was it worth it? No idea yet.

Pro's
Coming out of a tuck, I can start to put the power back on at a higher speed.
If your body is used to pedaling at a certain cadence, you'll be a few %age points faster at the same cadence
Hills are really no harder than they were before, even on the lowest gear; you really only added 4 or 5% to it and the body seems to adjust OK to that.

Cons
Costs money
You have to relearn your shifting, I'm still getting used to having to stay on the small ring for an extra gear before hopping up the large. Its weird to have to think about shifting, it was pretty ingrained and now I've changed it all

I'd say do it if you really find yourself spinning out lots and you have the legs to push the big gears; you really don't make up much time on the down slope, but being able to get back on the power a bit earlier is a good way to carry the speed further. Otherwise, if you're not a total clock watcher/strava addict (I may be one, the other or both), there really may not be much advantage to it.