I have done a lot of research in this areas, in summary,
in some scenario, large rotor might stops longer due to brake bias imbalance. Brake balance is an such important factor to be considered, unfortunately, it is very hard to adjust, even with bigger front rotor, the braking distance actually increase..The first link below shows braking distance increase in a Honda DC5 after changing to a large front rotor
I won't go for larger rotor because if you study the brake mechanism (http://www.myturbodi...c/brake/PF3.jpg), master cyclinder is not designed for that. changing the rotor will just imbalnce the braking equation
I recommend you read the following articles. I have cleared up a lot of misconception about braking
http://www.sportcomp...tech/index.html - case where a well designed big brake kit on a modified car resulted in worse braking
http://www.zeckhause...kes.htm#Summary - test result on different size rotors, increasing the rotor size by 28mm will result in decreasing braking distance by 5 feet from 100mph to 0
http://www.myturbodi...q/brake_FAQ.htm
Ahh yes but you are talking about a single application of the brakes. Now if you were going on a mountain run, your little rotors will struggle while the bigger rotor will be able to absorb a lot more heat and thus delaying or avoiding the fade issue.
And the other thing, with gen4 camrys, it doesnt use the rears anyways. The car had done 70k and the rear pads were like 75% still...
Yes I have upgraded brakes and yes they do make a difference.