Whenever you get a new device, you use it more than you realize.
I've always gotten longer battery life out of every phone I've owned after the honeymoon/setup phase ends. It's natural that you fiddle with it more, download more, just plain play with it more as you get everything how you like it settings and App wise.
Yep... Just wait. You'll settle back into a more normal routine and get 2-3 days of light/moderate use.
I took my 1520 on a one month trip to Italy and used it like a boss every day for 32 days straight. Navigation, web searches, text, Skype, averaging over 100 photos a day with previewing and editing , sometimes video, Bing Translator, time waster games, etc. etc., etc. There were only 2 days out of 32 that I had to resort to my battery recharge stick.
You're gonna love it.