I never buy heavy saucepans in the first place specifically because of that reason. A bit like Arky, if it is too heavy, I take the bowl/plate to the pan and serve from there. If I have to lift from the oven, it is always going to be on a tray in the oven so that I can use to hands and the weight is spread over the length of the tray. Also, I ensure I have free space to place the tray before the oven gets opened.
If you have really heavy pans etc when they are empty, consider getting rid of them - however good you believe them to be. No point injuring yourself over a meal IMO.
Too many restaurants, not enough time...