It is certainly a matter of discipline. For myself, I can't fall asleep at night if I don't get in a quality day of work. I feel too guilty. I feel lazy. Other things aren't enjoyable if I haven't gotten my run done first. You don't want to stagnate; running can help bring a meaning to your life.
As far as making sure you get the miles once you get out the door, I recommend out and back courses. Mentally they are much easier (for me anyway). Moreover, once you get halfway, you HAVE to come back the full way. No cheaping out six miles into your ten mile day. You go out 5 miles you have to come back 5 miles.
Find new and interesting places to run around wherever you are. Go trailblazing. Find tunnels and rivers and streams and bridges. I would make a good bet that I know my area better than anyone who lives here, just because of all the miles I've logged exploring.
To me hard training is the best part about long distance running. It's sport in it's purest form. For the most part, until you reach the line of diminishing return, you will do better if you try harder. THat kind of work ethic is what makes this sport. I take pleasure in getting out there every day and training and hurting and feeling myself get stronger. I know I'm going places and doing things that very few people will ever do in their lifetime (not speedwise, i'm an average collegian, but mileage wise). That's something special. That should make you want to burst out the door.
Another thing to look forward to is the feeling you'll get after the run. The feeling of satisfaction, recovery, delight. Your body thanking you for stopping. Having the knowledge that you are continuing to move forward, toward a target, a goal, always upwards.
Get out and run and be wild and free, or stay in and be lazy and stagnant and one of the crowd. It sounds like you are a serious runner also, you know what is neccessary to find out how good you can be.