depends on the pictures.
batch processing works fine if the pictures were all taken in similar lighting conditions. But since you will have different pictures taken in different conditions, you can't just batch them all together at once (at least I don't think so).
Be careful if you will switch between RAW and jpeg (you may forget to switch back). Plus, how will you decide what is the "most important parts"? That sounds subjective. To me it would make more sense to shoot jpeg in the scenes where the shooting conditions are easy (the light is good, there are no weird color casts, etc.) and saving RAW for those times where things are tricky and there is a higher chance that the pictures will not come out.
Alternatively, if your camera is fast enough and your memory cards are big enough, and if your camera has the capability, then shoot RAW and jpeg simultaneously.
your comment: "I also don't have lightroom, only cs5"
my answer: boy, some people don't appreciate what they have. Kids today . . . ungrateful!!!
I see nothing wrong with taking as many pictures as you can AS LONG AS YOU DON'T JUST DUMP THEM ON THE WEDDING COUPLE. As a photographer it will be your job to get rid of the redundant shots and the ones that don't come out. The professional photographer who worked for one of my relative's weddings clearly stated that there was no limit to the number of pictures he would take withing the allotted time (he used film, not digital). The pictures were great; he was a real professional. Just don't overwhelm your clients with unnecessary proofs.
Hopefully you are not the main photographer, but are just taking pics as a guest.