*A dishwasher or a garbage disposal in my kitchen. I have had to wash dishes by hand at least once a day. Until you live without one you forget how inconvenient it is to have to wash and dry every single thing you use. Fortunately, since I am living in only 700 sq feet and I have a small kitchen, most of my things are in storage. I am sure that most of my friends are sick of hearing me say "Yes, I do have that, but it is in storage".
*An attached laundry room. You see, for most of my married life you could find me daily running to the laundry room in various stages of dressed-ness to get clothes. But now my laundry room is down a flight of outside stairs and in the garage. So now whenever I need to run to the laundry room I have to get dressed. Plus if it is raining - or snowing, like today - I get my clean laundry all wet. Someday I will be able to run to the laundry room in the buff again!
*A septic system that you can count on. For the last two months our septic system has been obsessed with backing up. It makes it pretty difficult to do laundry on a regular basis or count on a flushing toilet to not come back up. We have dumped many precious pennies into this system and now all we can do is laugh. It is something I will never take for granted again.
*More than one shower & bathroom for a family of 4. Trying to schedule the morning routines around one shower and toilet can be a bit of a challenge. However, we have gotten used to this and it goes pretty smooth now. Looking on the bright side, having the septic back up all the time, does limit down the shower and flushing allowed, so it is even easier on the schedule.