This topic has been covered here before: Just because something requires very little time on its own does not mean it disrupts less. Any activity that takes “only a small amount of time” is likely to be accompanied by many other ones that carry the same justification for their existence.
Justifying that something should be done because it takes an insignificant amount of time is the same as saying that a 0.02% increase in your property tax should not concern you. The individual amount may be insignificant, but after years of property tax increases, you may end up with 1 or 2% extra in taxes. More importantly, every additional request will carry the extra guilt trip of having accepted increases before and may embolden further, possibly larger requests.
Deep thought tasks require deep concentration–see Maker’s Schedule, Manager’s Schedule. You can’t do deep analysis or intense tasks if you have 30 minutes between meetings.
Meetings are only one such offender. Logging your time by work code and customer, and filling out three pages of forms upon beginning or ending a task are other such offenders. Let’s say that you were reading an unabridged copy (1488 pages) of Les Misérables (Signet Classics), and every 10th page, read a page of A Tale of Two Cities (free Kindle Edition). You’re going to get the details of the characters confused because the settings are so similar.
This example may seem extreme, but in reality, is this not what all of this extra tasks are doing? You record time about a project. You send an email about a project. You open some form and fill out information about the project. At some point you may actually do work on the project. At this point, you’re going to have to start a spreadsheet to keep track of your tasks and what necessary steps you’ve done as part of completing a task. Fortunately, you can at least create some sort of calculated field to turn the task green, yellow, or red, based on whether the task is complete, partially complete, or not started. That should save you the mental energy of determining whether a task is actually complete–so at least you have that going for you.