Mine sounds about along the norm, judging by the above. My '89 notch uses a quart about every 1000 miles, as well, and my '90 Town Car only uses one quart between oil changes. I get a light puff of blue smoke occasionally when I really romp on the notch, but the Lincoln doesn't smoke at all ... although the lifters have been a little noisy for over a year now (but haven't worsened at all).
My notch has about 255k on it now, had a rebuild somewhere around 150k - the original owner didn't flagrantly abuse it, but he did race it, apparently ... and the kid that had it for 6 months after him and before me just beat the holy hell out of it - and it was converted from AOD to a T-5 at about the same time, so I've got about 100k on both items. I've replaced just about every sensor and emissions control item under the hood, fuel injectors, exhaust, etc. ... but the block, heads, and intake are still the originals with just a rebuild (don't know if the original owner bored out the cylinders at all or just cleaned 'em up and put in stock-sized rings). Runs like a raped ape with no signs at all of quitting anytime soon.
The Town Car, on the other hand, has about 205k on it now, and it is 100% bone stock, all original (motor, tranny, and rear end), and the intake plenum hadn't even been off EVER until about 195k when I replaced the leaky valve cover gaskets. I'm sure it's easily got another 25 to 50k left in it before the motor, itself craps out; the AOD shifts fine and all, but I'm sure it'll be the first item to die out before it sees 250k miles. Not that I care, anyway, since my ex is selling it in February when she leaves the country...
As far as longevity, I'd say the 5.0 rates pretty far above the norm, just so long as you give them proper care and feeding and don't abuse them like a psycho. Still, I'd probably put a 4.6 a few notches above the 5.0 in the long-run ratings, as I've seen those things top 300k in patrol cars and taxis without needing bearings or a re-ring (although the valve seals do tend to leak at around 100k on the '91 to '98 model 4.6's).