Wow, people really need to read... this has been hashed over MANY times across all the forums...
https://forums.macrumors.com/threads/771791/
In short, you won't see nor notice ANY difference between running the 32 bit vs 64 bit kernel, all the apps you run will be 64 bit. Yes, you have a 64 bit machine and you'll be doing everything (except the actual kernel which is 1% of the OS) will be 64 bit.
Sit 2 identical Macs side by side, 1 running 32 bit kernel, 1 running 64 bit. I guarantee you won't know the difference unless you bing up system info and look for it.
+1 thanks