I do put a bit in water to make it boil quicker for rice, pasta etc though. I don't find you have to add much to bring down the boiling temperature of water.
I do that too, fwiw, but it's effectively an old wives tail by all accounts. There is some scientific basis in the theory - there'll be a half degree Celsius rise for every 58 grams of salt dissolved per kilogram of water according to the boffins, but the pinch or two you add will make approximately fuck all difference.A few real world tests, adding way more than you'd add normally, will show only a marginal difference in boiling times.
Don't really eat ready meals, but use quite a lot in cooking and have crisps too often and chips too often, I really like salt 
