I'm not too surprised that you found some vibrato fairly fast, OMGitsDannie.  I don't think the angles used are exactly the same, but it is similar enough that at least some sort of a vibrato can be managed pretty early, if you are used to using vibrato on guitar.  Like slides, it isn't precisely the same muscles moving in exactly the same way on violin and guitar, but the understanding of the basics of how it works makes slides fairly easy to start using on violin, if you are already used to them from guitar. 

One has to remember though that being a fretted instrument, guitar can only do a vibrato up from the fretted note, while violin can also go below.  From what I understand, a "proper vibrato" on violin fluctuates evenly above and below the target pitch, and the amount of "wobble" that is possible in practical playing is also greater.  

Still, some of what is needed for the movement is similar enough, and being accustomed to doing such techniques on guitar helps, I think. 

I've played guitar for over 35 yrs, violin for only a few months.  But I do feel that the two instruments work well together in the sense that practice done on one somewhat helps with playing the other.  One unexpected thing I noticed is that playing violin does help one's guitar playing.  There were a couple months shortly after I got the violin that I was being a bit obsessed with the new toy and wasn't playing guitar much beyond a few minutes of basics every day.  I expected to get rusty, but it didn't happen.  When an old friend dropped by for a bit of a jam session guitar went quite well, as if I had only been slacking on practice maybe a little bit.  Even had a few new licks that I'd developed on violin that transferred to guitar with no real work. 

Guitar and violin have some obvious differences, but do seem perhaps close enough that they somewhat help each other if you happen to play both.  At the very least, though, one doesn't get the standard noob problems of sore fingers and cramping hand muscles.   LOL