Here at Language Infusion we use the terms "analytical" study of a language in contrast to training your language "intuition". Dr. Krashen used the terms "language learning" about the analytical study of grammar, and language "acquisition" about the ability to use the language practically. It is acquisition activities (listening and reading) that takes you towards fluency so you can actually use the language in real life.
In one area Dr. Krashen admitted that analytical "learning" (studying grammar) was valuable, to train your self-censorship skill. Self-censoring is your ability to correct your own grammar mistakes. "The monitor" is the term he used. That skills is less useful when you are speaking, since you don't have time to "look up" a grammar rule in your memory and select the right answer when you are speaking at full speed in real-time. It is however useful when you are writing. If your language intuition becomes unsure about what is correct grammar when you are typing a letter or document, you can pause for a few seconds and think about it. When you proof-read what you have written, "the monitor" can flag incorrect writing when it sees it.
There is also a cool function for more long term reviewing called "Refresh" (a button on the right hand side when you log into the course). Words and phrases that you have learned will show up days and weeks later for a quick review before they slip out of your memory. You can se a graph of how many words you have learned, and how many of these are either "fresh" or "stale" (the latter category needs to be reviewed now). Words that you spent longer time learning (and answer incorrectly several times) will appear sooner on the Refresh-function than words you learned quickly and easily. Once again, you get to spend your time on what is most important for your personal language learning.
Reimar Vetne, PhD
your language coach
Language Infusion UK & Norway