Omar
Bit of a tough one to answer as features are very 'personal'. I find myself often saying, "Don't do it like that', but in fact, if you get it done, are comfortable and reasonably efficient, why change. I would say two things
1) Styles are great, but VERY underused. The one good thing about setting up styles is that you not only keep a set theme in your sheets, but you avoid the real danger in Excel of running into the 'too many cell formats' error, as each variation of colour, border, bold, etc is counted as a format and the threshold in versions before 2007 is very low in this regard. Setting styles, ensures a cell that looks like a total for example, is sure to be exactly the same as any other total style and count as one. In 2007, while the limit has increased, the themes and styles are much better organised and displayed. I use them all the time.
2) Views are similar and not very 'discoverable' but you are using them as intended. I used to use them a lot for weekly reports, but have now discovered Pivot Tables. This is something you should take a look at.
Looking forward to you getting to 'High School'
Regards
Nick Hodge
Microsoft MVP, Excel
Southampton, UK