Why does everybody assume the solution to threatening vehicles on the road like drunks or an SUV behind you is to speed up?
Honestly, I wonder the same thing.
You need contact/exchange of body fluids.
Right... *CONTACT*... this includes things like sweat, which can happen anywhere on the skin, so yes, it can be transmitted simply by touching someone who has it.
Layer effects is actually a specific category of non-destructive editing.
And I'm not saying that everyone should use GIMP now if it doesn't meet your needs... I'm only saying that people who've been suggesting that GIMP is, in terms of the actual number of features, sorely lacking compared to photoshop are mistaken. The problem is not quantity, it is that the few features which *ARE* missing are critical to some people,
And that's okay.... I'm just pointing out that GIMP is getting there.
But hey.... if you want to continue to shell out hundreds of dollars every few years for an upgraded version of photoshop indefinitly, who am I to argue that you should keep your money?
If you are genuinely interested knowing what is in the pipe for the future of GIMP, you may be interested in taking a look at this for a summary of features that are slated for the next or upcoming versions of GIMP. You may notice that many tasks are dependant on completion of GEGL implementation (something that is definitely slated for being in the next release). Once GEGL support is fully in, significant features such as user-defined color spaces, non-destructive editing, and smart objects will become feasible, and are already planned for a future version of GIMP
As for things that GIMP will do which Photoshop doesn't, I can refer you to obvious fanboyish pages such as 10 reasons that GIMP is better than photoshop, but of course, if GIMP doesn't do what you actually need, then I can appreciate how any or even all of those points can be far from convincing. Ultimately, the only reason to use GIMP over Photoshop depends entirely on whether GIMP can do what you actually need. If it can, then the difference in price alone can easily be a determining factor. If it can't, well... then it can't. But that doesn't mean it never will. And you should use what you need, for now. I'd encourage anyone to keep an open mind for the future, however.
Those who can, do; those who can't, write. Those who can't write work for the Bell Labs Record.