I sort of do this when job-hunting too. Like you, I used to spot a job and stop looking and immediately apply, or apply as soon as practicable.
But then I changed what I was doing and started carrying on looking through the email newsletter or website jobs listings, because I didn't want to spend four hours working on an application form for a job with a closing date next week, only to find after I'd done it that there was a closing date tomorrow for a different job, and I'd now miss that deadline.
So I started to carry on looking, usually the beginning of the week I'd go through jobs newsletters, search the usual websites. I didn't have a spreadsheet though. I would make a note in my diary of the deadline. And I would also email myself a C&P of the job ad with a link, "subject: job ad 4/3 job title" where 4/3 or 15/3 or 1/4 was the closing date, so if I didn't have my paper diary to hand, I could also search my email inbox for job ad and I'd be able find the roles I was interested in and see their closing date at a glance. And when I got round to applying, I didn't have to try to remember where I'd seen the original job ad, because I'd C&P'd and sent myself a link.
Another way I found it helpful to sort of list the jobs/deadlines first before applying for them was that instead of knee-jerk applying for anything and everything I could possibly do as soon as I came across the job ad, I'd be looking at the jobs and deadlines and thinking there's Job A and Job B, I could do both of those. But actually, I'm more interested in working for Company A, or in Sector B, so it was making me more discerning and I was focusing and spending more time on fewer applications as a result.
I think that's where many people go wrong, using that scattergun approach, wasting time doing the bare minimum on lots of applications.
If you're keeping track and doing it more 'mindfully' (to use a twee term), then I think the quality of your applications is arguably better.
There is a downside to this more methodical rather than reactive approach to job applications, though, and that is that I've occasionally been caught out when they've closed applications early.