If that's all you do, it probably won't be a big deal to you to upgrade. I'd skip this upgrade.
I myself upgraded (and gave my ipad 1 to my mother). It is faster, but really only somewhat in day to day functions. Web browsing is faster. Not exceptionally faster, but faster. Emailing, nope nothing there. I think Netflix is a bit more responsive in that I feel like when I tap on the screen to bring up the controls it responds a fraction faster (maybe because it has 2 cores to do everything now?).
As stated, multi-taskers, gamers, heavy app users it is almost a must. That's the reason my mother is getting my iPad 1. For her, it won't make a hill of beans of difference (ibooks is going to feel just the same on either).
Edit: I should state my big reason for upgrading was Facetime. I travel a lot so now I don't have to lug my personal computer with me and I can just take my work laptop and my ipad rather than two full laptops.