I used to have the same problem. I have several different machines set up and part of my problem was I always needed something that was at another machine. I was lucky & scored this awesome sewing desk from a craigslist ad.
This is my main sewing center w/ my must used machine. So everything is well within reach w/o always having to get up. I do have scissors, rippers, bobbins etc at each machine along w/ any attachments for that particular machine.
Now this is not to say I don't still lose items but it happens alot less. I didn't explain this very well but I guess you have to find what works for you. I did alot of reorganizing before I came up w/ a plan that worked for.