Originally posted by sewebster own the software = have a license
I don't have photoshop, but did buy lightroom (thankfully student license!) but I think the main thing is that in lightroom you can easily flip through all your photos, hit a few keys, click the mouse a few times to make your adjustments.
In photoshop presumably you click "file->open" then search around a while to figure out where your photo is, then load it up, look at it, decide what you want to do, make adjustments, then save it and repeat for the next photo.
I think the differences listed here are kind of key... I have been evaluating different Raw converters and was looking at Lightroom vs. Photoshop/ACR. Besides price, the thing that really makes Photoshop insufficient to Lightroom (if you call it that) is the DAM aspects.
The thing for me is that I already have a completely different DAM that performs better than that integrated into Lightroom at which case, Lightroom is reduced to nothing more than ACR with a different interface. This doesn't mean it is bad, but it does make it expensive for a Raw converter. I feel like I might as well spend the extra money for Photoshop just because I can have all the added features and stick to my current program for image management. These are all just my frame of thought coming from a hobbyist point of view...
At this point, as a hobbyist, Photoshop isn't that important to me. RAW processing is important as is price. That being said, I can probably get the aspects of Lightroom that I need using Photoshop Elements and ACR or I can shift to programs like Silkypix or LightZone that make excellend RAW processors that are a little more full featured than ACR. I am waiting though to see whether Lightroom 2.0 makes any vast improvements in RAW handling. I'm not in a huge hurry to make a decision as currently I use RawTherapee, which is actually a decent RAW converter that is free. There are just some great features that paid software has that I would like, like batch processing.