Yep, me too, but only to a degree: I've always looked for sparring partners from different arts. From the year dot in aikido I looked for people to test it on from other arts: boxing, goju-ryu, a shotokan derivative, other fu, tai chi, kendo, jujutsu...
Then I started chun cos it was the best option in a place I moved to where they didn't have my (then) primary art of aikido (or at least any good stuff).
Then I moved to Japan where I also can't find any decent aikido (ironically), but I am surrounded by MA not such a long way away... and ironically I have no time, so it's still a question of what I can get to when! When I had the time tho, I did seek out groundfighting and boxing to sharpen up certain skills. On occasion I also try to learn TKD kicks from my TKD teacher friend... but I suck royal arse at them, never having really practised a kicking style.