I know this is the standup forum but could you explain in what ways aikido helped your judo game?
As mentioned above by
@Thycidides, Judo and Aikido share drills & footwork and many old Judoka "retire" to Aikido where they can still use their Judo skills in a less aggressive, less competitive and injury-prone setting.
Both arts also use similar mechanics but explain and practice them differently. A personal example: in Judo the coach would tell me to "pull this arm down and raise the other" before executing a certain throw. This was slightly confusing to me as a beginner and I would often focus on one arm too much. Explaining a similar looking throw my Aikido sensei said "imagine turning a huge wheel" - and immediately I understood the motion and executed it fluidly with both hands. I tried the same approach in Judo and my technique improved.
On the other hand I've noticed that for many "arm throws" of Aikido - if the opponent is resisting well and refuses to be thrown, you can always add some hip / leg and effort to the technique - and suddenly you get a very Judo-like throw.
This leads me to the Kuzushi aspect. Kuzushi (unbalancing) is a major part of every Judo, Aikido and Jujitsu technique. There are many articles written on the subject, like the ones below:
http://judoinfo.com/kuzushi/
http://judoinfo.com/kuzushi1/
(both great reads for a Judoka BTW)
To me, Judo is (greatly simplified) "Kuzushi + effort".
Aikido on the other hand (again simplified) "Kuzushi - effort".
I have heard some people (even Judoka) say that "Aikido is perfect Judo". I understand it like this: if Kuzushi is done perfectly (especially if the opponent can't resist OR has just taken a hit
(atemi!)) he will be thrown to the ground effortlessly in 'perfect' fluid motion.
This is the goal of Aikido technique - but also of Judo technique! Only in Judo you never imagine such a scenario since everyone's resisting in randori and most throws are forced. But even in Judo competition, given certain conditions and appropriate skill, some throws look beautifully effortless, Aikido-like.
Of course, before you learn to walk you have to learn to crawl - and before you learn to throw people effortlessly you have to try throwing resisting opponents to see when and where effort should be applied and when and where it isn't necessary.