Rethinking winter training

I guess it's not winter yet but since I hurt my shoulder I've been advised to stay inside and ride on the trainer (and I have for the last month).
Now, if you know me and talk to me then it is inevitable that the subject of "bikes" comes up often. I often talk about bikes and about the fact that I spend alot of time riding and training. Yet it seems like even though I talk with friends often about training theory all of the time I rarely ever talk with them about specific intervals they do, when they do them and how long they rest between them. I haven't had many of these particular conversations until lately with Dirty Mike. Once I started my winter training early this year he asked me "What workouts do you do on the trainer?" I told him about the one workout I do everyday, all winter, for the last 3 seasons. Then he asked "Why? I've never heard of anyone doing anything like that."
"Because I read about it in an article about it once. I think it was in Bicycling Magazine," I said.

Then I started my quest to find out where I had read it and why I did it. I reread much of what I have read in the past and some new things. I even bought Carmichael's new book. What I found was what I had thought originally. I was essentially doing steady state intervals at lactate threshold-LT (as described in just about everything Carmichael writes) which are effective for raising LT but not much good for increasing max power. I found that even though this method of training was pretty good for increasing TT power it probably isn't ideal. So now the difficult part begins. What should I be doing instead?