You don’t develop your habits in a vacuum. You have an inconvenient and undersized coin purse at least in part because you have no incentive to make coins convenient. If coins could represent the only currency you have to pull out to make a purchase, I think you’d find a way to make them a bit more convenient. As it is, you have to deal with bills AND coins every time you buy something, how that’s easier than a coin-only transaction is beyond me.
I think that’s the one that could buy that Learjet, isn’t it? Or maybe even a couple?
The heck I do! 
I either use bills only (and receive coins in change) or (most often) I use a debit card. I can’t remember the last time I used a coin to pay for anything except from a vending machine. My use of coins is like this: eventually, my purse gets enough of an accumulation of them at the bottom that I will dump them in a drawer or jar somewhere, after picking out the quarters for use in the vending machine at school.
I’m not terribly worried about the whole issue, mind you. I think I’m being mistaken for one of those seriously anti-dollar-coin people because I voiced an opinion, but I’m not. It really doesn’t affect me too much because I rarely use cash of any kind, far preferring to use a debit card. I only chimed in to mention that for some of us, coins are a pain in the neck.
Nonetheless, Sir, one must not disagree with OpalCat.
It is, quite un Doperesque. 
You may only pay with bills, but you get stuck with coins on the back end. When you use cash, you open your billfold to take out bills. Then you receive bills AND coins as change, stuff the bills back into the billfold, open the coin purse and dump the coins in, close them both up and you’re on your way. If you paid only in coins, you’d open up the coin purse once, pull out the coins you want, dump all the change back in, and never have to touch the billfold at all.
That’s efficiency! You only have to open up one container, only have to deal with one type of currency, and all your change goes back into that same container.
You would also never have to let the thing get overfilled to be dumped into a jar, because it’s always in use, coins going in and out with most purchases.
Well, as I said, most of this is moot in my case as I virtually never use cash anyway. I find the whole thing to be a hassle, bills, coins, and all. I make about 99% of my purchases with my debit card. Just about the only time I use cash is if I’m out to eat with a group of people and need to chip in for my share. And that happens less than once a month.
On the top of actually using cash, though, I don’t like the idea of a separate change purse/wallet. That’s just more things to keep track of in my purse… and thus, by necessity, the change purse section of my wallet is small. I realize that men have “billfolds” but women generally don’t. My wallet is much larger than that, and has lots of nooks and crannies for different things–but not a checkbook–it just has an unfortunately tiny zippered area for change. Not only is it small, but it’s hard to use because the opening isn’t large enough for you to get two fingers into for grabbing coins, and the pocket inside is flat enough that turning it upside down doesn’t result in all the coins falling out.
My whole point, though, is that while there is an argument for getting rid of $1 bills in favor of a coin, there is also a valid argument for keeping the bills because there are real reasons that some people don’t like coins.
Oh, anecdote here. I worked at a topless bar about 13, 14 years ago that let you essentially get cash from your credit card, with a fee, by selling you “tokens” that you could charge. The tokens were worth $5 each and were larger than a dollar coin. Ask me how much the dancers hated being tipped with tokens. Go on, ask me.