A few things. Washing in hot water and high spin cycles will wash out colours and promote stretching and holes. Those are best left for linens and towels. Washing in warm water, or even cold water (especially for dark colours) will prolong the integrity of the garment. Always rinse on cold water. Of course washing in colder temperatures may be less effective for removing dirt and oils, so it's not ideal for particularly soiled clothes. That all being said, I'm super lazy and stuff all my casual wear (ie, non-delicates) together -- whites, darks, you name it -- on the warm cycle to split the difference and like I said, most of what I've owned has lasted several years. And I buy some pretty cheap crap. Many newer washers have cycles labeled with things like "casual wear" that are warm wash/cold rinse and lower agitation and spin to avoid damage. This cycle is your friend.

But honestly, I think the true secret is not tumble-drying everything. I hang up most of my clothes to dry and then shove them in together with wet towels/socks/underwear to dewrinkle if needed. It saves on power and only adds maybe five minutes to my routine. You don't need a huge drying rack either. I bought something like this that takes advantage of vertical space, and can hang quite a few things with a small footprint.

I don't consider myself a domestic goddess in particular but I hope these tips are useful to you or someone else in the future!