It’s tradition but if you don’t feel like it then don’t do it. Talk to your officiant and ceremony venue manager about other options based on the location -- is there a side entrance near the altar you can walk in from? Is there a trap door you can pop out of? (I'm kidding, unless of course you're into theatrics.)
I would also ask yourself what is it about walking down the aisle you don’t like or want to avoid. If it’s the attention then skip the wedding and elope because as the bride (and groom) all eyes will be on you all night long.
There are ways to make the processional simpler: skip the large bridal party, don’t adorn the aisle with a lot of decor, play a light song.
As for walking up the aisle after the ceremony I would do it and not slink out the side door. Your guests want to celebrate this wonderful moment with you so take your time making your way up the aisle and acknowledge their cheers and best wishes.
