I've had that problem before. There are a couple of things I can recommend. First, it sounds like your dryer drys extremely hot or not really hot. Either extreme will cause your clothes to wrinkle.
When I wash Jeans, I first try not to make too heavy a load (that's why I don't wear jeans all the time anymore) and only wash them with other denim. One reason for this is that denim is thick and needs room to expand and allow the fabric to relax. Then, I don't try them until they are 100% dry. I get them almost done and then shake them out and dry them on a clip hanger long ways. Oh, and too much fabric softern may be as bad as too little, as well. This gets expensive, but you can also run the jeans load through a extra rinse cycle to make sure you've got all the detergents out.
Second thing I can recommend is if you have "Dollar General Stores" or "Family Dollar Stores" ( not like run of the mill 'everything's a dollar store', more like general merchanside stores) I have found a "generic Downy" wrinkle release spray. It's great because it is about $ 1.50 for a fairly large container and the name brand in this Large size would be about $5.00. If you want to wear jeans that day, take them off the hanger and spray them, shake them well and put them in a pre-warmed dryer (that takes about 3 mins for the dryer to warm up)
for a couple of minutes. I usually get crisp no-iron jeans that are also softened up a little when I put them on.
Other neat laundry tricks....
* Try scrubbing the filter in your dryer. The stuff in the fabric softener sheets gunks up the lint filter. Just take some Hot soapy water and scrub it with an old toothbrush. You will notice the difference in how much water runs through the filter.
* always clean the lint filter, it's the second highest cause of appliance fires behind stove/ovens.
* though it's the ultimate pain, and it says to do it on the container anyway, always fill your washer with water and your cleaning solutions before you put the clothes in, it helps distribute the cleaning agents and makes your clothes rinse cleaner. Oh yeah, last thing, the hardness of your water may vary. You can usually find out the general info about that from your county home extention agent. Last time I checked, Wal-Mart had Borax (now there's an old name for you) which is an old fashioned water softener to help your soap work better in hard water areas.
Sionora, Sk8m8