Nadine, that sounds like a good way to find a pair of jeans, but I definitely know what you are saying about the time thing - who has time to spend a whole day trying on jeans?! I generally wear mine until they're ridiculous (worn out, too big, too small, .... whatever) and then dash out for a quick trip, try on three pairs and buy one!
My issue is, the jeans that fit fine in the changeroom, and then change shape when you wear them! Mine always are snug when I buy them, and then relax as I wear them, to the point of falling off my rear! I've also got the bigger hip/thigh, smaller waist thing, but just about every woman I know has the same frustration with jeans - not enough leg/hip room, and too much waist. Who are they making these pants for??!!

If someone finds the "wonder pair" let me know!