Yes, yes and yes(digitaldog, Pete,Rand)...
LR is not really a DAM. As recommended look elsewhere. BUT it does just about everything else for me well, I am finding it hard to just use ACRaw once used to the GUI of LR(perhaps Adobe can mirror ACRaw to be LR Develop tab? Miracle anyone?) There is a topic section Digital Asset Managment.
Maybe it can include DAM/Workflow management?
I'm in the midst of testing IDImage, Media Pro1.2, ACDSeePro5, (I have tested others and have ruled them out for one reason or other.
What is nice about LR is that it does take the thinking out. It holds your hand and makes it easy in the steps of ingesting files. And the keywording as well as the Collections tab are great, BUT, you really can't make it manage your content. Also very limited if you like having a catalog per client or keeping them lean. You have to open each to ingest multiple subjects from one card to each(close backup open ingest, repeat). Without LR supporting a few other formats AND not having a Browser window it can update with, it is at best a false sense of security if you rely on it alone. Other DAMs will likely not read and know how things are managed. You can't get to the files in a logical manner remotely or from a netwrok. So these things are folder structure strengths. As Digitaldog, I strongly agree with his comments.
Another major down side is that what is out of site is out of mind, and with an existing database, (you may have one small enough for 1, but I dont like more than 1K images per)..You forget about a lot of photos you wish you could browse through.
Bridge crashes on me regularly, and I avoid it. My folders are setup mostly like yours for work. BUT, my family images I like the way LR takes them and reorganizes them by date. this works somewhat OK, so I do use it for family images in this manner. I thought to use it for stock imagery also, but have some issues.
If LR had a browser and supported other formats, I would deal with the multiple catalog import export hassles.0 The interface is very logical in my way of working and familiarity.
And as far as the other DAMs...I like ACDSee so far, and IDImager. ACDSee easy able yet limited on network and multiple license metadata sharing aspects. IDImager, very able, just a bit getting used to it, also thumbnails sometimes get corruct (MediaPro has this issue also, but much worse)..but once these are OK, and I get a better handle of the Metadata controls(LR is easy) it maybe a winner...we will see.