I sometimes finish a Rosary as I drive to work. Like you, often I am not sure I have the number correct, either. No, meditation and contemplation cannot be as deep, but often a thought does come along that makes for a good reflection throughout the day.
(Those who don't believe in purgatory, skip the rest.)
Years ago when I was working on the family genealogy, I would pray the rosary for my ancestors as I came across yet another name. I would do this during morning walks through the desert.
One afternoon I was on the computer, working on a family link, when I had this urge (some might liken it to a voice in my head) to type in a name that was not on this particular chain. What the heck, I was curious and decided to go along with this invisible presence. The directions for the computer input were clear, and none of them followed the logic and research I use. But I was having fun so I kept going until suddenly I came across a new name in a totally different link. I was puzzled, and was thinking what a strange help the subconscious must be to help me discover this new information in an out-of-the-way place.
I do believe we may be closer to the spirit world than we know, but why would one of my ancestors suddenly want to help me with my genealogy project? And for the last time that faint, invisible voice spoke. "So that you will add my name and pray the rosary for me, too." (And, no, that family was not Catholic.)
I know, odd story! Was it just my own subconscious? Not sure. The reason it is an odd story is because it was a truly odd experience.