RoboForm, LastPass, and other password managers would not have defended your individual passwords from the Heartbleed bug. But they make the cleanup process a whole lot easier.
I have been a happy Roboform user for many years. As the linked article states I used it to quickly (relatively quickly) update and change passwords on my online profiles at numerous sites. Roboform will generate new passwords and then store them for you.
Another feature I really like that I use almost every day is the auto fill function. It will fill in online forms for you with all the usual info, name, address, phone number and even credit card numbers. A great time saver.